TPS - MIL ON/Erratic Idle/Acceleration Sag
85chrysler12
Models
1984 & 1985 Vehicles Equipped With 2.2L EFI or Turbocharged Engine
1986 Vehicles With 2.2L Turbocharged Engine
Subject
Power Loss/Limit
Light On Or Intermittent Erratic Idle/Sag On Acceleration
Index
DRIVEABILITY
Date
October 21, 1985
No..
18-22-85 REVISION A
This bulletin supersedes Technical Service Bulletin #18-22-85 which should be removed from your files. The following changes have been made:
^ One new part number throttle position sensor common to both EFI and Turbo.
^ New sensor package will no longer include an "O" ring. The sensor must be installed without an "O" ring.
^ On EFI vehicles only, sensor position will be inverted 180~.
^ New throttle position sensor has an improved internal lubricant to resist contamination.
^ Includes 1986 turbocharged vehicles - 1986 EFT vehicles are not involved.
SYMPTOM/CONDITION
^ Power loss/limit lamp may come on and induce fault code 24 into logic module memory.
^ Intermittent erratic idle and/or sag on acceleration.
DIAGNOSIS
To be sure as to what actually is causing either of the above conditions, use the appropriate Driveability Test Procedure.
Since the failure of the throttle position sensor is intermittent, the sensor may show okay when using the Driveability Test Procedure and the procedure may indicate the logic module requires replacement. Because this is an intermittent problem. DO NOT REPLACE THE LOGIC MODULE. Instead, connect a voltmeter to ground and:
^ 1984 models - PIN 2-5 of logic module
^ 1985-86 models - PIN 2-21 of logic module
Turn key to "ON" position. Voltmeter should read:
^ 1 volt +/- .5 volt at closed throttle
^ At least 3-1/2 volts at wide open throttle
If voltage is not to specification or if drive procedure indicates logic module replacement, follow the repair procedure below to replace the throttle position sensor.
PARTS REQUIRED
Throttle Position Sensor Repair Package - EFI/Turbo - PN 5227597
Consists of:
1 Throttle Position Sensor PN 5227488
1 Grease Packet PN 4300247
2 Tie Wraps PN 6015756
A special silicone grease for the throttle body 6-way connector is included in the parts package. Under no circumstances should any other type grease be used in the connector or sensor failures may occur.
REPAIR PROCEDURE
1. Disconnect the throttle body 6-way connector.
NOTE: THE FOLLOWING STEPS ONLY APPLY TO THE THROTTLE BODY HALF OF THE 6-WAY CONNECTOR. NO MODIFICATIONS ARE REQUIRED IN THE ENGINE HARNESS HALF OF THE CONNECTOR.
Figure 1 - EFI THROTTLE BODY:
Figure 2 - TURBO THROTTLE BODY:
Figure 3 - WIRING CONNECTORAS VIEWED FROM SENSOR HALF - TERMINAL END:
2. Remove all the wires from the throttle body 6-way connector (Figures 1 and 2). Note location of each wire for correct reinstallation (Figure 3).
3. Thoroughly clean the throttle body connector of all grease using Mopar Brake and Carburetor Parts Cleaner, PN 4318037.
4. Thoroughly clean the two A.I.S. motor wire terminals of grease.
5. Blow dry connector with compressed air.
6. Remove the old throttle position sensor from the throttle body. Make sure the sensor "O" ring does not stay in opening of throttle body. If it does, remove it and discard.
7. Install throttle position sensor.
Figure 1 - EFI THROTTLE BODY:
NOTE: ON EFI ONLY VEHICLES, INSTALL SENSOR IN THE INVERTED POSITION (180~ OPPOSITE FROM THE ORIGINAL POSITION - FIGURE 1).
8. Torque sensor mounting screws to 25 inch pounds.
CAUTION: OVER TORQUING MAY CAUSE SENSOR TO MALFUNCTION.
Figure 3 - WIRING CONNECTORAS VIEWED FROM SENSOR HALF - TERMINAL END:
9. Route throttle position sensor wiring in convolute along existing convolute and the wrap together with PN 6015756. Reinstall all the wires into their correct position in the previously cleaned connector (Figure 3).
10. Fill the 6-way connector with the silicone grease supplied with the new sensor.
11. Reconnect the throttle body 6-way connector.
12. Start engine, place transmission in neutral, apply park brake, and open throttle several times to wide open throttle position. Power loss/limit light should be off. If lamp comes back on, repeat Driveability Test Procedure.
POLICY: Reimbursable within the provisions of the warranty
TIME ALLOWANCE: Refer to the Labor Operation Time Schedule for appropriate labor operation number and failure code.