D21 Hardbody 2WD L4-2389cc 2.4L SOHC (Z24i) (1988)
1.
Perform the Mode III Self-Diagnostics procedure shown in the appropriate model Service Manual.
a.
If no Trouble Codes (Code 44 or, for 1988 models, Code 55) are found, proceed to Step 2 on the following page.
b.
If a Trouble Code is found, correct the condition as described in the appropriate model Service Manual. If the original incident still exists,
return to the beginning of Step 1.
2.
Test the injectors for proper operation by performing an "Injector Balance Test" as follows. NOTE:
The throttle body harness connector numbers for the applied vehicles are listed below:
MODEL
CONNECTOR #
Truck/Pathfinder (Z24i)
64M
Truck/Pathfinder (VG30i)
70M
Van (Z24i)
19F
a.
Check the operation of injector "A" by disconnecting the red wire from the throttle body harness connector (at the location shown below) to
disable injector "B".
b.
Start the engine and allow to idle. With injector "B" disabled, the engine should run at idle on injector "A" in the FAIL-SAFE MODE. If idle
is satisfactory, injector "A" is good. Turn off the engine, reconnect the red wire disconnected in Step 2a and proceed to Step 2c. If the engine
will not idle, or idles poorly, injector "A" is faulty and should be replaced.
c.
Check the operation of injector "B" by disconnecting the green wire from the throttle body harness connector (at the location shown above) to
disable injector "A".
d.
Start the engine and allow to idle. With injector "A" disabled, the engine should run at idle on injector "B" in the FAIL-SAFE MODE. If idle
is satisfactory, injector "B" is good. Turn off the engine, reconnect the green wire disconnected in Step 2c and proceed to Step
3.
If the engine will not idle, or idles poorly, injector "B" is faulty and should be replaced.
3.
If injectors "A" and "B" are both determined to be operating satisfactorily, and the incident still exists, contact the FIXS Hotline for additional
assistance.
PARTS INFORMATION
APPLIED MODEL
INJECTOR PART NUMBER
1986.5 TRUCK(Z24i)
16021-03G15
1987 TRUCK/
16021-41G00
PATHFINDER (Z24i)
1986.5-1987 TRUCK
16021-12G00
1987 PATHFINDER (VG30i)
1988 TRUCK PATHFINDER
16021-41G00
(Z24i & VG30I)
16021-41G00
1987-1988 VAN
16021-17C00
Technical Service Bulletin # 96-032
Date: 960417
Engine Controls - Idle, Base Idle & Timing, Startability
Classification:
EC96-004