honda Workshop Repair Guides

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Engine - Occasional Rough Idle|Page 1935 > < Engine - Occasional Rough Idle|Page 1929
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Throttle Position Sensor: All Technical Service Bulletins
Engine - Occasional Rough Idle

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).

Engine - Occasional Rough Idle|Page 1935 > < Engine - Occasional Rough Idle|Page 1929