Oxygen Sensor - Rough Idle/Lack of Power/Black Smoke

NO: 18-06-95
GROUP: Vehicle Performance
DATE: Feb. 3, 1995

SUBJECT:
Engine Runs Poorly, Lacks Power Idles Rough And/Or Blows Black Smoke

MODELS:
1994-1995 (BR) Ram Truck

NOTE:
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH A 5.9L H.D. OR 8.0L ENGINES BUILT PRIOR TO SEPTEMBER 1, 1994 (MDH 09-01-XX)

SYMPTOM/CONDITION:
Engine runs poorly, lacks power, idles rough and/or may blow black smoke at operating temperatures.

DIAGNOSIS:
Test drive vehicle, ensuring that vehicle is at full operating temperatures. Using the Mopar Diagnostic System (MDS) or the Scan Tool (DRBII 1994 MY or, DRBIII 1995 MY) with appropriate diagnostic procedure manual, check the 02 circuits for the sensor outputs. If any of the above symptoms are present or DRB II/III (Scan Tool) diagnosis indicates left 02 sensor output stuck on rich rail and right on lean rail, proceed with the repair procedure.

REPAIR PROCEDURE:
This bulletin involves correction of the two 02 sensors at the wire harness connectors.

02 Sensor Harness:

1. With the vehicle on a hoist examine the left (Figure 1) and right (Figure 2) O2 sensor wires at the black connectors. Both sensor's wire harness connections should have a BK/LB wire, DG/O wire and BK/W wire.
2. The remaining wire in the right O2 sensor connector should be a black/dark green wire.

The remaining wire in the Left O2 sensor connector should be a tan/white wire.

3. If the wires in step 2 are reversed, disconnect the two O2 sensor connectors and reconnect them in the opposite sensors. For routing refer to Figures 1 & 2.
4. Verify that the wires are connected properly as listed in step 2.
5. All fault codes should be cleared using the ORB II/III (Scan Tool).

POLICY: Reimbursable within the provisions of the warranty.

TIME ALLOWANCE:
Labor Operation No: 25-01-70-97 0.5 Hrs.
Sensor, Oxygen - Reroute Wires and
Reconnect. 94-95 BR

FAILURE CODE: WV - Wiring Misrouted