1996 PCED OBDI | SECTION 18: Diesel Diagnosis — 7.3L DI Engine |
AR: Output Circuit Check (OCC) High
AR1 DIAGNOSTIC TROUBLE CODE (DTC) 1660
- DTC 1660 indicates that the output circuit check is high.
- Possible causes:
- High system voltage
- VREF circuit fault
- Faulty powertrain control module (PCM)
- Perform charging system and battery tests.
Is charging system OK?
| Yes | No |
|---|
| GO to AR2. | REPAIR charging system as required. |
AR2 VREF CIRCUIT CHECK
- Disconnect PCM. Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.
- Install breakout box, leave PCM disconnected.
- Key on.
- Measure voltage from Pin 90 to ground.
Is voltage less than 0.25 volt?
| Yes | No |
|---|
| GO to AR3. | REPAIR short to power in VREF Circuit 351 (BR/W). CLEAR DTCs and RETEST. |
AR3 PCM CHECK
- Reconnect PCM.
- Perform KOEO Self Test.
Is DTC 1660 still present?
| Yes | No |
|---|
| REPLACE PCM. RETEST system. | System test OK. |