Wagoneer L6-242 4.0L VIN M FI (1988)
Technical Service Bulletin # 185188
Date: 880523
Crankshaft Position Sensor - No Start/Hard Restart
Models
1987 & 1988 Cherokee, Wagoneer Comanche
Subject
No Start, Hard Restart, or Engine Die-Out
Index
DRIVEABILITY
Date
May 23, 1988
No.
18-51-88
(C18-51)
P-2040
Symptom/Condition, Diagnosis & Parts Information
SYMPTOM/CONDITION
Some 1987 and 1988 Cherokee, Wagoneer and Comanche models with the 4.0L engine may experience an engine no start, hard restart or die-out
condition. This condition may be the result of inadequate signal strength from the crank position sensor (CPS).
DIAGNOSIS
Prior to performing this bulletin verify the following:
1.
The engine idle speed is 750 RPM. If not, refer to the adjustment procedures in I.S. Note 46E (M.R. 244 Cherokee/ wagoneer) or 39E (M.R. 277
Comanche).
2.
The vehicle has been checked with MS 1700 Diagnostic Tester and any indicated malfunction corrected.
If a problem persists proceed with the repair procedure below.
PARTS REQUIRED
Automatic Transmission Service Kit:
PN 83-100-066 Crank Position Sensor Patch Harness Crank Position Sensor (CPS)
W/Elongated Hole Tie Straps (3) CPS Grommet (Dust Cover)
Manual Transmission Service Kit:
PN 83-100-063 Crank Position Sensor Patch Harness Crank Position Sensor (CPS) Tie
Straps (3)
NOTE:
INITIAL PARTS ORDERS WILL BE LIMITED UNTIL SUFFICIENT STOCK BECOMES AVAILABLE.
Repair Procedure
1.
Turn the ignition switch to the "OFF" position.
2.
Disconnect the negative and positive battery terminals.