1A
Inspection of ECM and Its Circuits
ECM and its circuits can be checked at ECM wiring connectors by measuring voltage and resistance.
CAUTION:
ECM cannot be checked by itself. It is strictly prohibited to connect voltmeter or ohmmeter to ECM with connector disconnected from it.
Voltage Check
1) Remove ECM (1) from body referring to Engine Control Module (ECM) Removal and Installation:M13A .
2) Check voltage and/or pulse signal at each terminal of connectors (2) connected, using voltmeter (3) and oscilloscope (4).
NOTE:
• As each terminal voltage is affected by the battery voltage, confirm that it is 11 V or more when ignition switch is ON.
• Voltage with asterisk (*) cannot be measured by voltmeter because it is pulse signal.
Check it with oscilloscope if necessary.
Viewed from harness side
1. ECM 2. ECM connectors
ECM Terminal Voltage Values Table
Terminal No. wire color Circuit Normal Voltage Condition Remarks
E115-1 BLK Ground for ECM Below 0.3 V Ignition switch turned ON. —
E115-2 BLK Ground for ECM Below 0.3 V Ignition switch turned ON. —
E115-3 BLK Ground for ECM Below 0.3 V Ignition switch turned ON. —
E115-4 BLU/RED EVAP canister purge valve output 10 – 14 V Ignition switch turned ON. —
*0 – 0.6 V
↑ ↓
8 – 14 V
(Refer to Reference waveform No.20 ) 		Vehicle running at 20 km/h, 12 mph with after warming up engine. Output signal is active low duty pulse. Duty ratio varies depending on vehicle condition.
E115-5 BLU/ORN Power steering pressure switch signal 10 – 14 V Ignition switch turned ON. —
0 – 1 V With engine at idle speed, turning steering wheel to the right or left as far as it stops.
E115-6 GRN/YEL IAC valve output *0 – 2 V
↑ ↓
8 – 14 V
(Refer to Reference waveform No.18 ) 		Ignition switch turned ON. Output signal is active low duty pulse. Duty ratio varies depending on engine condition.
*0 – 2 V
↑ ↓
8 – 14 V
(Refer to Reference waveform No.19 ) 		Engine running at idling with after warming up engine.
E115-7 PNK/BLK Heater output of heated oxygen sensor (engine equipped with EGR valve) 10 – 14 V Ignition switch turned ON. —
*0 – 2 V
↑ ↓
8 – 14 V
(Refer to Reference waveform No.13 and Reference waveform No.14 ) 		Engine running at idling with after warming up engine. Output signal is active low duty pulse. Duty ratio varies depending on engine condition.
E115-8 WHT/BLK Fuel injector No.4 output 10 – 14 V Ignition switch turned ON. —
*0 – 0.6 V
↑ ↓
8 – 14 V
(Refer to Reference waveform No.4 and Reference waveform No.5 ) 		Engine running at idling with after warming up engine. Output signal is active low pulse. Pulse frequency varies depending on engine speed.
E115-9 RED/WHT Fuel injector No.1 output 10 – 14 V Ignition switch turned ON. —
*0 – 0.6 V
↑ ↓
8 – 14 V
(Refer to Reference waveform No.4 , Reference waveform No.8 and Reference waveform No.25 ) 		Engine running at idling with after warming up engine. Output signal is active low pulse. Pulse frequency varies depending on engine speed.
E115-10 BLK/BLU Ground for sensors Below 0.3 V Ignition switch turned ON. —
E115-11 WHT CMP sensor signal (vehicle not equipped with immobilizer control system) 0 – 1 V or 4 – 5 V Ignition switch turned ON. —
*0 – 0.6 V
↑ ↓
4 – 5 V
(Refer to Reference waveform No.11 and Reference waveform No.12 ) 		Engine running at idling with after warming up engine. Sensor signal is pulse. Pulse frequency varies depending on engine speed. (6 pulses are generated par 1 camshaft revolution.)
GRN/BLK Engine coolant temp. (ECT) sensor signal (vehicle equipped with immobilizer control system) 3.3 – 3.8 V Ignition switch turned ON, ECT at 0 °C, 32 °F —
1.38 – 1.72 V Ignition switch turned ON, ECT at 50 °C, 122 °F
0.40 – 0.53 V Ignition switch turned ON, ECT at 100 °C, 212 °F
E115-12 — — — — —
E115-13 RED Oxygen signal of heated oxygen sensor (engine equipped with EGR valve) 0 – 1 V Ignition switch turned ON. —
*Deflects between over 0.5 V and under 0.45 V
(Refer to Reference waveform No.13 and Reference waveform No.14 ) 		While engine running at 2,000 r/min. for 1 min. or longer after warmed up engine.
RED/BLU CO adjusting resistor signal (engine not equipped with EGR valve) 0 – 5 V Ignition switch turned ON. —
E115-14 GRN/BLK  
Engine coolant temp. (ECT) sensor signal (vehicle not equipped with immobilizer control system)
 		 3.3 – 3.8 V Ignition switch turned ON, ECT at 0 °C, 32 °F —
1.38 – 1.72 V Ignition switch turned ON, ECT at 50 °C, 122 °F
0.40 – 0.53 V Ignition switch turned ON, ECT at 100 °C, 212 °F
WHT CMP sensor signal (vehicle equipped with immobilizer control system) 0 – 1 V or 4 – 5 V Ignition switch turned ON. —
*0 – 0.6 V
↑ ↓
4 – 5 V
(Refer to Reference waveform No.11 and Reference waveform No.12 ) 		Engine running at idling with after warming up engine. Sensor signal is pulse. Pulse frequency varies depending on engine speed. (6 pulses are generated par 1 camshaft revolution.)
E115-15 LT GRN/BLK Intake air temp. (IAT) sensor signal (vehicle not equipped with immobilizer control system) 2.15 – 2.60 V Ignition switch turned ON, IAT at 20 °C, 68 °F —
0.46 – 0.60 V Ignition switch turned ON, IAT at 80 °C, 176 °F
0.18 – 0.23 V Ignition switch turned ON, IAT at 120 °C, 248 °F
GRN/RED CKP sensor signal (vehicle equipped with immobilizer control system) 0 – 1 V or 4 – 5 V Ignition switch turned ON. —
*0 – 0.6 V
↑ ↓
4 – 5 V
(Refer to Reference waveform No.11 and Reference waveform No.12 ) 		Engine running at idling with after warming up engine. Sensor signal is pulse. Pulse frequency varies depending on engine speed. (30 (36 – 6) pulses are generated par 1 crankshaft revolution.)
E115-16 LT GRN Throttle position (TP) sensor signal 0.5 – 1.0 V
(Refer to Reference waveform No.15 ) 		Ignition switch turned ON and throttle valve at idle position with warmed engine. —
3.4 – 4.7 V
(Refer to Reference waveform No.16 ) 		Ignition switch turned ON and throttle valve at full open position.
E115-17 GRY/BLU EGR valve (stepper motor coil 3) output (vehicle equipped with HO2S) 10 – 14 V Ignition switch turned ON. —
*0 – 1 V
(Refer to Reference waveform No.21 ) 		Engine running at idling with after warming up engine. Output signal is active low duty pulse. Pulse generated times depending on vehicle condition.
E115-18 GRY EGR valve (stepper motor coil 1) output (vehicle equipped with HO2S) 10 – 14 V Ignition switch turned ON. —
*0 – 1 V
(Refer to Reference waveform No.21 ) 		Engine running at idling with after warming up engine. Output signal is active low duty pulse. Pulse generated times depending on vehicle condition.
E115-19 BRN/BLK Ignition coil No.2 and No.3 output 0 – 0.6 V Ignition switch turned ON. —
*0 – 0.6 V
↑ ↓
3 – 5 V
(Refer to Reference waveform No.22 and Reference waveform No.23 ) 		Engine running at idling with after warming up engine. Output signal is active high pulse. Pulse frequency varies depending on engine speed.
E115-20 BRN/WHT Ignition coil No.1 and No.4 output 0 – 0.6 V Ignition switch turned ON. —
*0 – 0.6 V
↑ ↓
3 – 5 V
(Refer to Reference waveform No.22 , Reference waveform No.24 and Reference waveform No.25 ) 		Engine running at idling with after warming up engine. Output signal is active high pulse. Pulse frequency varies depending on engine speed.
E115-21 RED/GRN Fuel injector No.2 output 10 – 14 V Ignition switch turned ON. —
*0 – 0.6 V
↑ ↓
10 – 14 V
(Refer to Reference waveform No.4 and Reference waveform No.7 ) 		Engine running at idling with after warming up engine. Output signal is active low pulse. Pulse frequency varies depending on engine speed.
E115-22 LT GRN/RED Output of 5 V power source for TP sensor, MAP sensor and CO adjusting resistor (engine not equipped with EGR valve) 4.5 – 5.5 V Ignition switch turned ON. —
E115-23 GRN/RED CKP sensor signal (vehicle not equipped with immobilizer control system) 0 – 1 V or 4 – 5 V Ignition switch turned ON. —
*0 – 0.6 V
↑ ↓
4 – 5 V
(Refer to Reference waveform No.11 and Reference waveform No.12 ) 		Engine running at idling with after warming up engine. Sensor signal is pulse. Pulse frequency varies depending on engine speed. (30 (36 – 6) pulses are generated par 1 crankshaft revolution.)
LT GRN/BLK Intake air temp. (IAT) sensor signal (vehicle equipped with immobilizer control system) 2.15 – 2.60 V Ignition switch turned ON, IAT at 20 °C, 68 °F —
0.46 – 0.60 V Ignition switch turned ON, IAT at 80 °C, 176 °F
0.18 – 0.23 V Ignition switch turned ON, IAT at 120 °C, 248 °F
E115-24 — — — — —
E115-25 RED Knock sensor signal 2 – 3 V
(Refer to Reference waveform No.9 and Reference waveform No.10 ) 		Ignition switch turned ON. —
Engine running at 4000 r/min. with after warming up engine.
E115-26 GRN Manifold absolute pressure (MAP) sensor signal Approx. 1.8 V
(Refer to Reference waveform No.15 ) 		Ignition switch turned ON with barometric pressure at 100 kPa, 760 mmHg. —
Approx. 4.2 V
(Refer to Reference waveform No.16 ) 		When engine racing, after warming up engine with barometric pressure at 100 kPa, 760 mmHg.
E115-27 BLK/WHT ECT signal for combination meter *0 – 0.6 V
↑ ↓
10 – 14 V
(Refer to Reference waveform No.3 ) 		Ignition switch turned ON. Output signal is 1 Hz active low duty pulse. Duty ratio varies depending on ECT. ECT –40 °C (–40 °F)= 10% ON duty ECT 120 °C (248 °F) = 90% ON duty
E115-28 GRY/BLK EGR valve (stepper motor coil 4) output (vehicle equipped with HO2S) 10 – 14 V Ignition switch turned ON. —
*0 – 1 V
↑ ↓
10 – 14 V
(Refer to Reference waveform No.21 ) 		Engine running at idling with after warming up engine. Output signal is active low duty pulse. Pulse generated times depending on vehicle condition.
E115-29 GRY/RED EGR valve (stepper motor coil 2) output (vehicle equipped with HO2S) 10 – 14 V Ignition switch turned ON. —
*0 – 1 V
↑ ↓
10 – 14 V
(Refer to Reference waveform No.21 ) 		Engine running at idling with after warming up engine. Output signal is active low duty pulse. Pulse generated times depending on vehicle condition.
E115-30 GRN ABS signal (if equipped) 10 – 14 V Ignition switch turned ON. —
E115-31 WHT/GRN Fuel injector No.3 output 10 – 14 V Ignition switch turned ON. —
*0 – 0.6 V
↑ ↓
10 – 14 V
(Refer to Reference waveform No.4 and Reference waveform No.6 ) 		Engine running at idling with after warming up engine. Output signal is active low pulse. Pulse frequency varies depending on engine speed.
Terminal No. wire color Circuit Normal Voltage Condition Remarks
E114-1 PNK/BLU
(Left-hand steering vehicle) 		A/C compressor relay output (if equipped) 10 – 14 V Engine running, A/C switch OFF and heater fan switch OFF position. —
PNK
(Right-hand steering vehicle) 		0 – 1 V Engine running, A/C switch ON and heater fan switch 1st position or more. —
E114-2 — — — — —
E114-3 — — — — —
E114-4 — — — — —
E114-5 BLU/BLK Main power supply 10 – 14 V Ignition switch turned ON. —
E114-6 BLU/BLK Main power supply 10 – 14 V Ignition switch turned ON. —
E114-7 WHT Power source for ECM internal memory 10 – 14 V Ignition switch turned ON. —
E114-8 RED/GRN Duty output terminal 0 – 1 V Ignition switch turned ON. —
E114-9 — — — — —
E114-10 BLU Main power supply relay output 10 – 14 V Ignition switch turned OFF. —
0 – 2 V Ignition switch turned ON.
E114-11 BLK/WHT Ignition switch signal 0 – 1 V Ignition switch turned OFF. —
10 – 14 V Ignition switch turned ON.
E114-12 RED/WHT Rear defogger switch signal 10 – 14 V Ignition switch turned ON, rear defogger switch ON. —
0 – 1 V Ignition switch ON, rear defogger switch OFF.
E114-13 WHT/BLU Diagnosis switch terminal 4 – 5 V Ignition switch turned ON. —
E114-14 WHT/RED A/T fluid temp. sensor signal (A/T) Refer to Inspection of TCM and Its Circuits .
E114-15 PNK Test switch terminal 10 – 14 V Ignition switch turned ON. —
E114-16 GRN/WHT A/C switch signal (if equipped) 10 – 14 V Ignition switch turned ON, A/C switch and heater blower switch selected at OFF. —
0 – 1 V Ignition switch turned ON, A/C switch ON and heater blower switch selected 1st position or more.
E114-17 RED/YEL Lighting switch signal 10 – 14 V Lighting switch ON. —
0 – 1 V Lighting switch OFF.
E114-18 PNK/BLK A/C condenser fan relay output (if equipped) 10 – 14 V Engine running, A/C switch OFF and heater fan switch OFF position. —
0 – 1 V Engine running, A/C switch ON and heater fan switch 1st position or more.
E114-19 WHT/GRN Fuel pump relay output 0 – 2.5 V For 2 sec. from the time is ignition switch turned to ON or while engine is running. —
10 – 14 V On and after 3 sec. from the time is ignition switch turned to ON or while engine is stop.
E114-20 BLK/RED
(A/T) 		Starting motor signal 0 – 1 V Ignition switch turned ON. —
BLK/YEL
(M/T) 		6 – 14 V While engine cranking.
E114-21 GRN/WHT Stop lamp switch signal 0 – 1 V Ignition switch turned ON, stop lamp not lighted up. —
E114-22 YEL/GRN Vehicle speed sensor signal *0 – 1 V
↑ ↓
10 – 14 V
(Refer to Reference waveform No.17 ) 		Vehicle running. Sensor signal is pulse. Pulse frequency varies depending on vehicle speed. 21 pulses are generated par sec. at 30 km/h, 19 mph. (2548 pulses/km).
E114-23 — — — — —
E114-24 — — — — —
Terminal No. wire color Circuit Normal Voltage Condition Remarks
E113-1 WHT/RED A/C evaporator outlet air temp. sensor signal (if equipped) 3.4 – 3.7 V Ignition switch turned ON at A/C evaporator outlet temperature 0 °C (32 °F). —
2.5 – 2.8 V Ignition switch turned ON at A/C evaporator outlet temperature 15 °C (59 °F).
1.7 – 2.0 V Ignition switch turned ON at A/C evaporator outlet temperature 30 °C (86 °F).
E113-2 — — — — —
E113-3 — — — — —
E113-4 BLK/YEL A/C compressor signal for TCM (AT, if equipped) 0 – 1 V Ignition switch ON, A/C compressor turned ON. —
8 – 14 V Ignition switch ON, A/C compressor turned OFF.
E113-5 BRN/ORN Engine torque signal for TCM (AT) Refer to Inspection of TCM and Its Circuits .
E113-6 GRN/YEL D-range idle up signal (AT) 8 – 14 V Ignition switch turned ON, selector lever at “P” or “N”. —
0 – 1 V Ignition switch turned ON, selector lever at “R”, “D”, “3”, “2” or “L”.
E113-7 YEL/BLK Serial communication line of data link connector 5 V (vehicle equipped with immobilizer control system) 4 – 5.5 V Ignition switch turned ON. —
E113-8 — — — — —
E113-9 PPL/YEL Malfunction indicator lamp 10 – 14 V Engine running. —
0 – 1 V Ignition switch turned ON with engine stop.
E113-10 — — — — —
E113-11 PNK/GRN Serial communication line of data link connector 12 V 8 – 14 V Ignition switch turned ON. —
E113-12 YEL Torque control signal (AT) 9 – 14 V Ignition switch turned ON. —
E113-13 BLU/ORN Heater blower switch signal 10 – 14 V Ignition switch turned ON, heater blower switch selected at OFF. —
0 – 1 V Ignition switch turned ON, heater blower switch selected at 3rd speed position or more.
E113-14 BLK/BLU Ground for A/C evaporator outlet air temp. sensor Below 0.3 V Ignition switch turned ON. —
E113-15 BLK/RED Throttle opening signal for TCM (AT) Refer to Inspection of TCM and Its Circuits .
E113-16 BRN Engine revolution signal for tachometer 0 – 0.8 V Ignition switch turned ON with engine stop. —
*0 – 1 V
↑ ↓
8 – 14 V
(Refer to Reference waveform No.1 and Reference waveform No.2 ) 		While engine running. Output signal is pulse. Pulse frequency varies depending on engine speed. (2 pulses are generated par 1 crankshaft revolution. 3000 r/min. = 100 Hz)
E113-17 YEL/RED ECT signal for TCM (AT) Refer to Inspection of TCM and Its Circuits .
Reference waveform No.1
Ignition pulse (engine revolution) (2) signal at engine idling
Measurement terminal CH1: E115-11 (*E115-14) to E115-1
CH2: E113-16 to E115-1
Oscilloscope setting CH1: 5 V/DIV, CH2: 5 V/DIV
TIME: 40 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Engine at specified idle speed
1. CMP sensor signal
3. 720° crank angle
*: Vehicle equipped with immobilizer control system
Reference waveform No.2
Ignition pulse (engine revolution) (2) signal at engine idling
Measurement terminal CH1: E115-11 (*E115-14) to E115-1
CH2: E113-16 to E115-1
Oscilloscope setting CH1: 5 V/DIV, CH2: 5 V/DIV
TIME: 10 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Engine at specified idle speed
1. CMP sensor signal
3. 360° crank angle
4. 2 to 4 msec.
5. 10 – 14 V
*: Vehicle equipped with immobilizer control system
Reference waveform No.3
Engine coolant temperature signal for combination meter at engine idling
Measurement terminal CH1: E115-27 to E115-1
Oscilloscope setting CH1: 5 V/DIV
TIME: 400 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Engine at specified idle speed
1. OFF signal
2. ON signal
3. One duty cycle (Approx. 1 sec.)
Reference waveform No.4
Fuel injector signal (2) at engine idling
Measurement terminal CH1: E115-11 (*E115-14) to E115-1
CH2: E115-8 to E115-1
Oscilloscope setting CH1: 5 V/DIV, CH2: 20 V/DIV
TIME: 4 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Engine at specified idle speed
1. CMP sensor signal
3. Fuel injection pulse width: 2 – 4 msec.
*: Vehicle equipped with immobilizer control system
Reference waveform No.5
No.4 fuel injector signal (2) at engine idling
Measurement terminal CH1: E115-11 (*E115-14) to E115-1
CH2: E115-8 to E115-1
Oscilloscope setting CH1: 5 V/DIV, CH2: 20 V/DIV
TIME: 40 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Engine at specified idle speed
1. CMP sensor signal
3. 720° crank angle
*: Vehicle equipped with immobilizer control system
Reference waveform No.6
No.3 fuel injector signal (2) at engine idling
Measurement terminal CH1: E115-11 (*E115-14) to E115-1
CH2: E115-31 to E115-1
Oscilloscope setting CH1: 5 V/DIV, CH2: 20 V/DIV
TIME: 40 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Engine at specified idle speed
1. CMP sensor signal
3. 720° crank angle
*: Vehicle equipped with immobilizer control system
Reference waveform No.7
No.2 fuel injector signal (2) at engine idling
Measurement terminal CH1: E115-11 (*E115-14) to E115-1
CH2: E115-21 to E115-1
Oscilloscope setting CH1: 5 V/DIV, CH2: 20 V/DIV
TIME: 40 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Engine at specified idle speed
1. CMP sensor signal
3. 720° crank angle
*: Vehicle equipped with immobilizer control system
Reference waveform No.8
No.1 fuel injector signal (2) at engine idling
Measurement terminal CH1: E115-11 (*E115-14) to E115-1
CH2: E115-9 to E115-1
Oscilloscope setting CH1: 5 V/DIV, CH2: 20 V/DIV
TIME: 40 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Engine at specified idle speed
1. CMP sensor signal
3. 720° crank angle
*: Vehicle equipped with immobilizer control system
Reference waveform No.9
Knock sensor signal at engine speed 4000 r/min.
Measurement terminal CH1: E115-25 to E115-1
Oscilloscope setting CH1: 1 V/DIV
TIME: 10 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Run engine at 4000 r/min.
Reference waveform No.10
Knock sensor signal at engine speed 4000 r/min.
Measurement terminal CH1: E115-25 to E115-1
Oscilloscope setting CH1: 1 V/DIV
TIME: 200 µs/DIV
Measurement condition
• After warmed up to normal operating temperature
• Run engine at 4000 r/min.
Reference waveform No.11
CMP sensor signal at engine idling
Measurement terminal CH1: E115-11 (*E115-14) to E115-1
CH2: E115-23 (*E115-15) to E115-1
Oscilloscope setting CH1: 2 V/DIV, CH2: 2 V/DIV
TIME: 20 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Engine at specified idle speed
1. CMP sensor signal
2. CKP sensor signal
3. 360° crank angle
4. 4 – 5 V
5. 36 – 6 = 30 CKP pulse
*: Vehicle equipped with immobilizer control system
Reference waveform No.12
CMP sensor signal at engine idling
Measurement terminal CH1: E115-11 (*E115-14) to E115-1
CH2: E115-23 (*E115-15) to E115-1
Oscilloscope setting CH1: 2 V/DIV, CH2: 2 V/DIV
TIME: 10 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Engine at specified idle speed
1. CMP sensor signal
2. CKP sensor signal
3. 30° crank angle
4. 10° crank angle
5. 360° crank angle
6. 36 – 6 = 30 CKP pulse
*: Vehicle equipped with immobilizer control system
Reference waveform No.13
Heated oxygen sensor signal (1) at engine idling
Measurement terminal CH1: E115-13 to E115-10
CH2: E115-7 to E115-1
Oscilloscope setting CH1: 500 m/DIV, CH2: 10 V/DIV
TIME: 1 s/DIV
Measurement condition
• After warmed up to normal operating temperature
• Engine at specified idle speed
2. Heated oxygen sensor heater signal
Reference waveform No.14
Heated oxygen sensor heater signal (2) at engine idling
Measurement terminal CH1: E115-13 to E115-10
CH2: E115-7 to E115-1
Oscilloscope setting CH1: 500 m/DIV, CH2: 10 V/DIV
TIME: 200 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Engine at specified idle speed
1. Heated oxygen sensor signal
3. OFF signal
4. ON signal
5. One duty cycle
Reference waveform No.15
Manifold absolute pressure sensor signal (1) at ignition switch turned ON
Measurement terminal CH1: E115-26 to E115-10
CH2: E115-16 to E115-10
Oscilloscope setting CH1: 2 V/DIV, CH2: 1 V/DIV
TIME: 200 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Ignition switch turned ON
2. Throttle position sensor signal
Reference waveform No.16
Manifold absolute pressure sensor signal (1) at engine racing
Measurement terminal CH1: E115-26 to E115-10
CH2: E115-16 to E115-10
Oscilloscope setting CH1: 2 V/DIV, CH2: 2 V/DIV
TIME: 200 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Engine racing
2. Throttle position sensor signal
3. Racing
4. Idle
Reference waveform No.17
VSS signal at 30 km/h (19 mph)
Measurement terminal CH1: E114-22 to E115-1
Oscilloscope setting CH1: 5 V/DIV
TIME: 20 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Drive vehicle at 30 km/h (19 mph)
1. ON signal
2. OFF signal
3. 10 – 14 V
4. One duty cycle (Approx. 45 – 55 msec.)
Reference waveform No.18
IAC signal at ignition switch turned ON
Measurement terminal CH1: E115-6 to E115-1
Oscilloscope setting CH1: 5 V/DIV
TIME: 2 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Ignition switch turned ON
• All accessory switch turned OFF
1. ON signal 3. One duty cycle (Approx. 4 msec.)
2. OFF signal 4. 8 – 14 V
Reference waveform No.19
IAC signal at engine idling
Measurement terminal CH1: E115-6 to E115-1
Oscilloscope setting CH1: 5 V/DIV
TIME: 2 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Engine at specified idle speed
• All accessory switch turned OFF
1. ON signal
2. OFF signal
3. One duty cycle (Approx. 4 msec.)
4. 8 – 14 V
Reference waveform No.20
EVAP canister purge valve signal
Measurement terminal CH1: E115-4 to E115-1
Oscilloscope setting CH1: 10 V/DIV
TIME: 100 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Drive vehicle at 20 km/h (12 mph)
1. ON signal 3. One duty cycle
2. OFF signal 4. 10 – 14 V
Reference waveform No.21
EGR valve signal
Measurement terminal CH1: E115-18 to E115-1
CH2: E115-29 to E115-1
CH3: E115-17 to E115-1
CH4: E115-28 to E115-1
Oscilloscope setting CH1: 20 V/DIV, CH2: 20 V/DIV,
CH3: 20 V/DIV, CH4: 20 V/DIV
TIME: 2 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Engine at specified idle speed
1. EGR valve stepper motor coil 1 signal
2. EGR valve stepper motor coil 2 signal
3. EGR valve stepper motor coil 3 signal
4. EGR valve stepper motor coil 4 signal
5. ON signal
6. OFF signal
Reference waveform No.22
Ignition coil signal at engine idling
Measurement terminal CH1: E115-20 to E115-1
Oscilloscope setting CH1: 2 V/DIV
TIME: 2 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Engine at specified idle speed
1. 4 – 6 V 2. 4 – 5 msec
Reference waveform No.23
Ignition coil No.2 and No.3 (2) signal at engine idling
Measurement terminal CH1: E115-11 (*E115-14) to E115-1
CH2: E115-19 to E115-1
Oscilloscope setting CH1: 2 V/DIV, CH2: 2 V/DIV
TIME: 40 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Engine at specified idle speed
1. CMP sensor signal
3. 720° crank angle
*: Vehicle equipped with immobilizer control system
Reference waveform No.24
Ignition coil No.1 and No.4 (2) signal at engine idling
Measurement terminal CH1: E115-11 (*E115-14) to E115-1
CH2: E115-20 to E115-1
Oscilloscope setting CH1: 2 V/DIV, CH2: 2 V/DIV
TIME: 40 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Engine at specified idle speed
1. CMP sensor signal
3. 720° crank angle
*: Vehicle equipped with immobilizer control system
Reference waveform No.25
Ignition coil signal and fuel injector signal at engine cranking
Measurement terminal CH1: E115-11 (*E115-14) to E115-1
CH2: E115-20 to E115-1
CH3: E115-9 to E115-1
CH4: E114-20 to E115-1
Oscilloscope setting CH1: 5 V/DIV, CH2: 5 V/DIV
CH3: 50 V/DIV, CH4: 10 V/DIV
TIME: 100 ms/DIV
Measurement condition
• After warmed up to normal operating temperature
• Engine at cranking
1. CMP sensor signal
2. Ignition coil No.1 and No. 4 signal
3. No.1 fuel injector signal
4. Engine start signal
*: Vehicle equipped with immobilizer control system
Resistance Check
1) Disconnect ECM couplers (1) from ECM with ignition switch OFF.
CAUTION:
Never touch terminals of ECM itself or connect voltmeter or ohmmeter (2).
2) Check resistance between each pair of terminals of disconnected couplers as listed in the following table.
CAUTION:
• Be sure to connect ohmmeter probe from wire harness side of coupler.
• Be sure to turn OFF ignition switch for this check.
• Resistance in the following table represents that when parts temperature is 20 °C (68 °F).
1. ECM coupler disconnected 2. Ohmmeter
Terminals Circuit Standard resistance Condition
E115-7 to E114-11 HO2S heater 5 – 6.4 Ω —
E115-9 to E114-5/6 Fuel injector No.1 12.0 – 13.0 Ω —
E115-21 to E114-5/6 Fuel injector No.2 12.0 – 13.0 Ω —
E115-31 to E114-5/6 Fuel injector No.3 12.0 – 13.0 Ω —
E115-8 to E114-5/6 Fuel injector No.4 12.0 – 13.0 Ω —
E115-28 to E114-5/6 EGR valve (stepper motor coil 4) 20 – 29 Ω —
E115-17 to E114-5/6 EGR valve (stepper motor coil 3) 20 – 29 Ω —
E115-29 to E114-5/6 EGR valve (stepper motor coil 2) 20 – 24 Ω —
E115-18 to E114-5/6 EGR valve (stepper motor coil 1) 20 – 29 Ω —
E115-4 to E114-5/6 EVAP canister purge valve 28 – 35 Ω —
E114-19 to E114-11 Fuel pump relay 160 – 240 Ω —
E114-10 to E115-1 Main relay 160 – 240 Ω Battery disconnected and ignition switch ON
E115-1 to Body ground Ground Below 1.5 Ω —
E115-2 to Body ground Ground Below 1.5 Ω —
E115-3 to Body ground Ground Below 1.5 Ω —