Engine - Occasional Rough Idle

91honda04

Bulletin No.
91-031

Issue Date
NOV. 1, 1991

File Under
ENGINE


Model

'89-91
CIVIC

Applicable To
SEE VEHICLES
AFFECTED


Occasional Rough Idle


SYMPTOM

1. The engine may occasionally idle roughly or erratically after coming to a stop with the throttle fully-closed.

2. On 1990-91 cars equipped with automatic transmission: Even though the proper procedure is followed, the shift interlock system may occasionally prevent the driver from shifting out of Park.

VEHICLES AFFECTED

All 1988-91 Civic models equipped with 1.5 liter engine and dual-point injection, thru VIN:

1HGED3...ML011574 (Sedan)
2HGED6...MH512869 (Hatchback)
JHMED3...MS031565 (Sedan)
JHMED8...MS012826 (CRX DX)
JHMEE2...MS004778 (2WD Wagon)

PROBABLE CAUSE

Inadequate grounding of the throttle angle sensor circuit.

CORRECTIVE ACTION

Replace the existing ground wire with the new ground harness listed under PARTS INFORMATION.

1. Disconnect the three-pin connector from the throttle angle sensor.

2. Remove the GRN/WHT wire from the three-pin connector with Pin Tool E, T/N 07JAZ-002050A, from the Terminal Pin Repair Kit (see TOOL INFORMATION).





3. Cut off the GRN/WHT wire as close as possible to the gray tape wrapping the wire harness. Discard the cut off piece.


4. Install the terminal end of the new ground harness into the three-pin connector. Gently pull on the wire to insure the pin is securely locked in the connector.





5. Route the new harness under the existing harness. Hold the harnesses together by wrapping them with 3M 33+ high-temperature electrical tape or equivalent. Wrap the tape as shown, making sure it completely covers the gray tape and any exposed end of the GRN/WHT wire.





6. Remove the bolt holding the harness bracket to the intake manifold. Install the eyelet on the new harness between the bracket and the manifold and reinstall the bolt.

NOTE: The harness eyelet must be installed as explained above. If it is installed between the bolt head and the bracket, the symptoms may not be corrected.


7. Reconnect the three-pin connector to the throttle angle sensor.

8. Test drive the car. Verify that it idles smoothly and at the proper speed.


PARTS INFORMATION

Grounding Harness: P/N 32105-PM5-315
H/C 3976487

TOOL INFORMATION

Terminal Pin Repair Kit: T/N 07JAZ-003000A
H/C 3087707

WARRANTY CLAIM INFORMATION

In warranty: The normal warranty applies.

Out-of-warranty: Any repair performed after warranty expiration may be eligible for goodwill consideration by the District Service Manager. You must request consideration, and get the DSM's decision, before starting work.

Operation number: 121168

Flat rate time: 0.3 hour

Failed part: P/N 32105-PM5-315
H/C 3976487

Defect code: 066

Contention code: C99