1997 PCED OBDII-Diesel | SECTION 5C: Pinpoint Tests |
AM: Output Circuit Check (OCC) High
AM1 DIAGNOSTIC TROUBLE CODE (DTC) P1660
- DTC P1660 indicates that the output circuit check is high.
- Possible causes:
- high system voltage
- VREF circuit fault
- damaged powertrain control module (PCM)
- Perform charging system and battery tests.
Is charging system OK?
| Yes | No |
|---|
| GO to AM2. | REPAIR charging system as required. |
AM2 VREF CIRCUIT CHECK
- Disconnect PCM. Inspect for damaged or pushed-out pins, corrosion and loose wires. Service as necessary.
- Install breakout box. Leave PCM disconnected.
- Key on.
- Measure voltage between Pin 90 and ground.
Is voltage less than 0.25 volt?
| Yes | No |
|---|
| GO to AM3. | REPAIR short to power in VREF Circuit 351 (BR/W). CLEAR DTCs and RETEST. |
AM3 PCM CHECK
- Reconnect PCM.
- Perform KOEO Self Test.
Is DTC P1660 still present?
| Yes | No |
|---|
| REPLACE PCM. RETEST system. | System test OK. |