Nissan and Datsun Workshop Service and Repair Manuals

Engine Control Module: Customer Interest
Engine Controls - New ECM Reduces Spark Knock

Classification:

Section:     Automatic

AT90-005

Transmission

Reference:
TECHNICAL BULLETIN NTB90-097
Models:
1990 300ZX [Z32] Date:
November 8, 1990
ENGINE DETONATION

(SPARK KNOCK)

SERVICE INFORMATION:

On some 1990 non-turbo 300ZX vehicles equipped with automatic transmissions, customers may complain of engine detonation [spark knock] during
vehicle operation. A countermeasure Electronic Control Unit (E.C.U.) is now available that reduces engine detonation.

SERVICE PROCEDURE:

When a customer complains of this incident, verify the following:

^

that UNLEADED PREMIUM gasoline has been used in the vehicle.

^

that the engine is tuned to specification [e.g., engine timing, idle speed, throttle valve switch, etc].

^

that the incident occurs under the following conditions:

1.

Intake manifold vacuum is between 5.91-7.87 in.Hg (150-200 mmHg]. 2. Engine speed is approximately 2000 rpm.

3.

Vehicle speed is approximately 60 mph.

If these points are confirmed, install the new E.C.U. into the vehicle. Confirm that the incident has been eliminated to the customer's satisfaction.
COUNTERMEASURE

FORMER

APPLIED MODEL

PART NUMBER

PART NUMBER

Federal -

Automatic Transmission

2371M-40P60RE

23710-30P13

California -
Automatic Transmission

2371M-40P65RE

23710-30P18