Test Procedures
- TC1 DTC P0A23: VERIFY THAT THE HARD FAULT IS PRESENT
- Record and clear all continuous memory DTCs.
- Retrieve the PCM continuous memory DTCs.
Is DTC P0A23 present?
Yes No GO to TC2 GO to TC7 - TC2 CHECK THE TGAC CIRCUIT FOR AN OPEN IN THE HARNESS
- Key in OFF position.
- PCM connector disconnected.
- Transaxle Assembly-B connector disconnected.
- Measure the resistance between:
( + ) PCM Connector, Harness Side ( - ) Transaxle Assembly-B Connector, Harness Side TGAC - Pin T5 TGAC - Pin 9 Is the resistance less than 5 ohms?
Yes No GO to TC3 REPAIR the open circuit. - TC3 CHECK THE TGAC CIRCUIT FOR A SHORT TO POWER IN THE HARNESS
- Key in ON position.
- Measure the voltage between:
( + ) PCM Connector, Harness Side ( - ) Vehicle Battery TGAC - Pin T5 Negative terminal Is the voltage less than 1 V?
Yes No Key in OFF position.
GO to TC4Key in OFF position. REPAIR the short circuit to PWR. - TC4 CHECK THE TGAC CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS
- Measure the resistance between:
( + ) PCM Connector, Harness Side ( - ) Vehicle Battery TGAC - Pin T5 Negative terminal Is the resistance greater than 10K ohms?
Yes No GO to TC5 REPAIR the short circuit to GND. - TC5 CHECK FOR THE TGAC CIRCUIT SHORTED TO SIGNALS IN THE SAME HARNESS
- Measure the resistance between:
( + ) Transaxle Assembly-B Connector, Harness Side ( - ) Transaxle Assembly-B Connector, Harness Side TGAC - Pin 9 ISDN2 - Pin 7 TGAC - Pin 9 GSDN-Pin10 TGAC - Pin 9 CTO - Pin 1 TGAC - Pin 9 TMAC - Pin 4 TGAC - Pin 9 MSDN - Pin 5 Are the resistances greater than 10K ohms?
Yes No GO to TC6 REPAIR the short circuit. - TC6 TGAC FUNCTIONAL TEST
- PCM connector connected.
- Transaxle Assembly-B connector connected.
- Isolate the TGAC pin from the Transaxle-B connector.
- Connect a 5 amp fused jumper wire between the following:
Point A Transaxle Assembly-B Connector, Harness Side Point B Transaxle Assembly-B Connector, Harness Side TGAC-Pin9 9TMAC-Pin4 - Key on engine running.
Does the engine start now?
Yes No Key in OFF position. INSTALL a new transaxle assembly. Key in OFF position. INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . - TC7 CHECK THE TGAC CIRCUIT FOR AN INTERMITTENT CONCERN
- Key in ON position.
- Access the PCM and monitor the TGAC PID.
- Carefully wiggle all accessible wiring and connectors associated with the circuit and look for a change in the PID state.
Is a concern present during the wiggle test?
Yes No Key in OFF position.
REPAIR as necessary.Key in OFF position.
GO to Pinpoint Test Z .