Knock Sensor Replacement - Service Manual Update (95-021)

Publication date: 1995-09-26
Reference number: 95-021

KNOCK SENSOR REPLACEMENT - SERVICE MANUAL UPDATE

TECHNICAL SERVICE BULLETIN

Reference Number(s): 95-021, Date of Issue: September 26, 1995

KNOCK SENSOR REPLACEMENT

Model(s): 1992-94 Acura Vigor

1995-96 Acura 2.5TL

Group: Engine

Bulletin No.: 95-021

Date: September 26, 1995

SERVICE INFORMATION

There is no procedure given in the service manual to replace either knock sensor. The time given in the Flat Rate Manual for replacement of the rear knock sensor allows for removal of the intake manifold, which is not necessary. See Fig 1

Fig 1: Knock Sensor Locations

SERVICE PROCEDURE

Use the procedure below, and the flat rate times given, when replacing a knock sensor.

FRONT KNOCK SENSOR REPLACEMENT

Get the customer's anti-theft radio code. Write down the radio station presets.
Disconnect the battery negative terminal.
Remove the breather hose. Remove the wiring harness mounting bolt. Move the wiring harness out of the way. See Fig 2

Fig 2: Breather Hose/Wiring Harness
Disconnect the electrical connector from the front knock sensor.
NOTE: If you are not able to reach the electrical connector with your hand, use a pair of 11 inch needle nose pliers. (Snap-On #911 CP or equivalent) .
Use a 24 mm socket and a universal extension to remove the knock sensor. See Fig 3

Fig 3: Knock Sensor Removal
Install the new knock sensor, tighten it to 34 N.m (3.4 kg-m, 25 ft-lbs). Reconnect the electrical connector. If necessary, make up the tool shown below to use as an aid in threading the sensor into the hole. See Fig 4

Fig 4: Fabricated Tool Diagram
Reinstall the wiring harness mounting bolt and the breather hose.
Reconnect the battery negative terminal
Enter the radio anti-theft code and the customer's station presets. Reset the clock.

REAR KNOCK SENSOR REPLACEMENT

Get the customer's anti-theft radio code. Write down the radio station presets.
Disconnect the battery negative terminal.
Locate the intake air bypass control solenoid underneath the rear of the intake manifold. Pull the solenoid and its vacuum tank loose from their mounting bracket.

Fig 5: Air Bypass Control Solenoid
Position the solenoid and tank so you can see the rear knock sensor. Disconnect the electrical connector from the sensor, then remove the sensor with a 24 mm socket on a universal extension. See Fig 6

Fig 6: Rear Knock Sensor Removal
Install the new knock sensor amen it to 34 N.m(3.4 kg-m, 25 Ib-ft). Reconnect the electrical connector.
Reinstall the IAB solenoid and tank back on the bracket.
Reconnect the battery negative terminal.
Enter the radio anti-theft code and the customer's station presets.
Reset the clock.

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 Technical Manager or your Zone Office. You must request consideration, and get a decision, before starting work.

Operation: 121187

Description: Replace front knock sensor

Flat Rate Time: 0.6 hr.

Operation: 121188

Description: Replace rear knock sensor

Flat Rate Time: 0.5 hr.

Failed P/N: 30530-P1R-A01

Defect code: Dependent on failure

Contention code: Dependent on failure