5A
DTC P0788 (No.13): Shift / Timing Solenoid Control Circuit High
Wiring Diagram
1. TCM [A]: Terminal arrangement of TCM connector (M13 engine model with VVT) (viewed from harness side)
2. Timing solenoid valve [B]: Terminal arrangement of TCM connector (M13 engine model without VVT) (viewed from harness side)
3. A/T      
DTC Detecting Condition and Trouble Area
DTC detecting condition Trouble area
Voltage of timing solenoid valve TCM terminal is high although TCM is commanding timing solenoid valve to turn OFF.
Timing solenoid valve circuit open or shorted to power circuit.
Timing solenoid valve malfunction.
TCM
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch OFF.
2) Clear DTC in TCM memory.
3) Start engine and shift selector lever to “N” range.
4) Repeat shifting selector lever from “N” range to “D” range and vice versa for 3 times.
5) Check DTC.
Troubleshooting
Step Action YES NO
1
Was A/T System Check performed?
Go to Step 2.
2
Check Timing Solenoid Valve Circuit for IG Short
1) Turn ignition switch ON and measure voltage between terminal “E121-14” [A] or “E123-10” [B] of harness side TCM connector and ground.
Is it 0 – 1 V?
Go to Step 3.
“WHT/GRN” circuit shorted to power circuit.
3
Check Timing Solenoid Valve Circuit for Open
1) Measure resistance between terminal “E121-14” [A] or “E123-10” [B] of disconnected harness side TCM connector and ground.
Is it 11 – 15 V at 20 °C (68 °F)?
Intermittent trouble or faulty TCM.
Check for intermittent referring to Intermittent and Poor Connection Inspection .
If OK, substitute a known-good TCM and recheck.
Go to Step 4.
4
Check Timing Solenoid Valve Resistance
1) Turn ignition switch OFF.
2) Disconnect valve body harness connector on transmission (1).
3) Check for proper connection to solenoid valve at “WHT/RED” circuit.
4) Check resistance of solenoid valve.
Resistance of timing solenoid valve
Resistance between terminal of transmission side valve body harness connector and transmission (ground (2)): 11 – 15 Ω (at 20 °C (68 °F))
“WHT/RED” circuit open.
Replace timing solenoid valve or lead wire.