5A
DTC P1735 (No.56): Air Conditioner Signal Circuit Malfunction (M13A Model without VVT)
Wiring Diagram
1. TCM [A]: Terminal arrangement of TCM connector (M13 engine model with VVT) (viewed from harness side)
2. ECM [B]: Terminal arrangement of ECM connector (M13 engine model without VVT) (viewed from harness side)
DTC Detecting Condition and Trouble Area
DTC detecting condition Trouble area
• Voltage of air conditioner signal ECM terminal is low although ECM command air conditioner compressor to turn OFF.
• Voltage of air conditioner signal ECM terminal is high although ECM command air conditioner compressor to turn ON.
• Air conditioner signal circuit malfunction.
• TCM
• ECM
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch OFF.
2) Clear DTCs in TCM and ECM memories.
3) Start engine and turn A/C switch ON to operate A/C compressor.
4) After 10 minute passed from starting engine, check DTC.
Troubleshooting
Step Action YES NO
1
Was A/T System Check performed?
Go to Step 2.
Go to A/T System Check .
2
Check Air Conditioner Signal Circuit for IG Short
1) Turn ignition switch OFF.
2) Disconnect TCM and ECM connectors from TCM and ECM.
3) Check proper connections to TCM at terminal “E124-14” and to ECM at terminal “E113-4”.
4) If OK, turn ignition switch ON and measure voltage between terminal “E124-14” of disconnected harness side TCM connector and ground.
Is it 10 – 14 V?
“BLK/YEL” circuit shorted to power circuit.
Go to Step 3.
3
Check Air Conditioner Signal Circuit for Open
1) Turn ignition switch OFF.
2) Check continuity between terminal “E124-14” of disconnected harness side TCM connector and terminal “E113-4”of disconnected harness side ECM connector.
Is continuity indicated?
Go to Step 4.
“BLK/YEL” circuit open.
4
Check Air Conditioner Signal Circuit for Ground Short
Check continuity between terminal “E124-14” of disconnected harness side TCM connector and ground.
Is continuity indicated?
“BLK/YEL” circuit shorted to ground.
Intermittent trouble or faulty TCM or ECM. Check for intermittent referring to Intermittent and Poor Connection Inspection . If OK, substitute a known-good TCM or ECM and recheck.