PGM-FI System

DTC Troubleshooting (cont'd)

11-521  

DTC 8: TDC Sensor Circuit Malfunction


  1. Reset the ECM/PCM (see page 11-468).
  2. Start the engine.

Is the MIL on and does it indicate DTC 8?

YES

- Go to step 3.

NO

- Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the TDC sensor and at the ECM/PCM.


  1. Turn the ignition switch OFF.
  2. Disconnect the TDC sensor 3P connector.
  3. Turn the ignition switch ON (II).
  4. Measure voltage between the TDC sensor 3P connector terminal No. 3 and body ground.

TDC SENSOR 3P CONNECTOR

Wire side of female terminals

Is there battery voltage?

YES

- Go to step 7.

NO

- Repair open in the wire between the PGM-FI main relay 1 and the TDC sensor.


  1. Measure voltage between the TDC sensor 3P connector terminal No. 2 and body ground.

TDC SENSOR 3P CONNECTOR

Wire side of female terminals

Is there about 5 V?

YES

- Go to step 8.

NO

- Go to step 10.


  1. Measure voltage between the TDC sensor 3P connector terminals No. 1 and No. 3.

TDC SENSOR 3P CONNECTOR

Wire side of female terminals

Is there battery voltage?

YES

- Go to step 9.

NO

- Repair open in the wire between the TDC sensor and G101.


  1. Substitute a known-good TDC sensor and recheck.

Is the MIL on and does it indicate DTC 8?

YES

- Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/PCM.

NO

- Replace the original TDC sensor.