Pathfinder 4WD L4-2389cc 2.4L SOHC (Z24i) (1987)
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Lock-Up Control Unit: All Technical Service Bulletins
A/T - Torque Converter Lock-Up In Reverse
Reference:
Date:
TECHNICAL BULLETIN
TS87-143
September 18, 1987
Classification:
Section: Models:
AT87-007
Automatic Transmission
1987 Truck 4WD & Pathfinder
TORQUE CONVERTER LOCK-UP IN REVERSE
APPLIED MODELS:
1987 4WD Truck (D21) 1987 Pathfinder (WD21)
APPLIED VINS:
Japan built, Prior to JN8HD16Y( )HW-020459 JN6HD11Y( )HW-000671 JN6HD16Y( )HW-005232
U.S. built,
1N6HD11Y( )HC-374490
1N6HD16Y( )HC-374484
SERVICE INFORMATION
Some 1987 Pathfinders and 4WD Trucks with automatic transmission may exhibit intermittent torque converter lock-up in reverse when cold. The
symptom is that the engine dies after a cold start when the foot brake is applied and the transmission lever is placed in the "R" position. This lock-up is
intermittent and is affected by the ambient temperature.
This torque converter lock-up is caused by an incorrect signal transmitted from the A/T Control Unit to the Lock-Up Solenoid. This can be verified by
measuring the voltage between Pin 3 (yellow wire) and Pin 5 (black wire) of the A/T Control Unit Connector (as shown below) when the incident occurs.
DIAGNOSTIC CHART
VOLTAGE
COMMENTS
DEALER ACTION
Approx. 1v
Incorrect signal. Converter
Replace control unit.
will lock-up in reverse.
Battery voltage
Control unit is operating
Contact Nissan FIX
normally. Converter should
Hotline.
NOT lock up in reverse.
PARTS INFORMATION
MODEL
PART NAME
NEW PART NO.
FORMER PART NO.
4WD Truck
A/T Control Unit
31036-32G11
31036-32G00
Pathfinder
A/T Control Unit
31036-42G10
31036-42G00
WARRANTY INFORMATION
CS
PNC
CT
OP CODE
FLAT RATE
R&R Control Unit
1F
31036
36
HJ36AA
0.3 hr.
Testing
HJ99AC
0.4hr.