PCM - MIL ON Intermittently/ Codes 17/24 Set
ARTICLE NO.95-21-5
10/23/95
LAMP - "CHECK ENGINE" LIGHT COMES ON INTERMITTENTLY WITH CODES 17 AND/OR 24 IN MEMORY - VEHICLES WITH 2.5L ENGINE
FORD:
1993 PROBE
This TSB is being republished in its entirety to update the Service Procedure.
ISSUE:
The "Check Engine" light may flash during warm-up after a cold soak. This may be caused by the Powertrain Control Module (PCM) logic allowing the system to go into closed loop.
ACTION:
Perform EEC Quick Test. Refer to the 1993 Powertrain Control/Emissions Diagnosis Manual (PC/ED), Section 5B, for service details. If EEC Codes 17 and/or 24 were displayed and no driveability concerns are present, install Control Unit Service Kit (F32Z-12B528-A) to resolve the codes and the "Check Engine" light condition.
If other EEC codes are retrieved (other than 17 and/or 24), diagnosis and repair must be performed to eliminate these codes prior to the installation of the Control Unit Service Kit.
Note
ONLY UNDER UNIQUE CONDITIONS WILL THIS CONCERN BE PRESENT. IF CODES 17 AND/OR 24 ARE PRESENT AND THERE ARE NO DRIVEABILITY CONCERNS, INSTALL THE CONTROL UNIT KIT. HOWEVER, IF THERE IS A DRIVEABILITY CONCERN, PERFORM DIAGNOSIS AS OUTLINED IN THE PC/ED MANUAL, SECTIONS 5B AND 6B.
REPAIR PROCEDURE
Obtain a Control Unit Service Kit (F32Z-12B528-A). Refer to the following procedure for installation instructions.
1. Disconnect the negative battery cable.
2. Remove the center console. Refer to the Powertrain Control Module (PCM) removal section in the 1993 Probe Service Manual, Page 03-04A-25.
3. Disconnect PCM Connectors C248, C247, and C246. Take the winding black electrical tape off the PCM main harness, Figure 1.
4. Using the solder/splice procedure (Figure 2), connect the kit harness (six wires) according to the following procedure. Refer to Figures 3 and 4 for pin locations (discard the Scotch locks included in the kit).
a. 4-1 Series Connection:
^ Find the PCM wire (blue) at terminal 1E of Connector C248.
^ Cut this blue wire approximately 70 mm (2.76 in) away from terminal 1E of Connector C248.
^ Connect the control unit wire (blue/yellow) to the main harness side of the above cut wire (blue) using the solder/splice procedure (Figure 2).
^ Connect the control unit wire (blue) to the connector side of the cut wire (blue) using the solder/splice procedure (Figure 2).
b. 4-2 Parallel Connection:
^ Find the PCM wire (black) at terminal 3B of Connector C246.
^ Cut this black wire approximately 70 mm (2.76 in) away from terminal 3B of Connector C246.
^ Connect the control unit wire (black) to the module wire (black) using the solder/splice procedure (Figure 2).
c. 4-3 Parallel Connection:
^ Find the PCM wire (red/black) at terminal 1B of Connector C248.
^ Cut this red/black wire approximately 70 mm (2.76 in) away from terminal 1B of Connector C248.
^ Connect the control unit wire (red/black) to the module wire (red/black) using the solder/splice procedure (Figure 2).
d. 4-4 Parallel Connection:
^ Find the PCM wire (red/white) at terminal 1I of Connector C248.
^ Cut this red/white wire approximately 70 mm (2.76 in) away from terminal 1I of Connector C248.
^ Connect the control unit wire (red/white) with the PCM wire (red/white) using the solder/splice procedure (Figure 2).
e. 4-5 Parallel Connection:
^ Find the PCM wire (blue/black) at terminal 20 of Connector C247.
^ Cut this blue/black wire approximately 70 mm (2.76 in) away from terminal 20 of Connector C247.
^ Connect the control unit wire (blue/white) with the PCM wire (blue/black) using the solder/splice procedure (Figure 2).
Note:
BE SURE THAT WIRE COLOR OF THE PCM WIRE AND CONTROL UNIT WIRE IS BLUE/BLACK AND BLUE/WHITE, RESPECTIVELY.
5. Connect the control unit wire connector to the control unit.
6. Connect the PCM connector to the PCM.
7. Mount the control unit to the top of the PCM with electrical tape.
8. Reroute the control unit connector wiring to prevent interference to/from other components. Tape or tie-wrap wiring accordingly.
9. Install the center console.
10. Disconnect the negative battery cable and depress the brake pedal for 5-10 seconds to ensure all EEC codes have been erased.
11. Reconnect the negative battery cable.
12. Drive the vehicle to verify the "Check Engine" light does not come on.
13. If the "Check Engine" light comes on again, check the wiring harness of the kit to verify that it has been properly installed.
14. If the "Check Engine" light still comes on and the Control Unit Service Kit is correctly installed, refer to the HO2S diagnostic procedure outlined in the PC/ED Manual, Section 6B.
Note
IF THE "CHECK ENGINE" LIGHT DOES NOT COME ON BUT CODES 17 AND/OR 24 REMAIN STORED IN THE PCM, DISREGARD THESE CODES.
Obtain an Authorized Modifications Decal and list the date, dealer number, and summary of modifications performed. Select a prominent place adjacent to the Vehicle Emission Control Information Decal suitable for installing the Authorized Modifications Decal. Clean the area, install the decal, and cover it with a clear plastic decal shield.
CONTROL UNIT SERVICE KIT
The Control Unit Service Kit (F32Z-12B528-A) contains the following:
^ One (1) Control Unit
^ One (1) Jumper Harness
^ Six (6) "Scotchlocks" - discard and use the solder/splice procedure (Figure 2)
^ One (1) Instruction Sheet (I.S. # 6540A)
PART NUMBER PART NAME
F32Z-12B528-A Control Unit Service Kit
OTHER APPLICABLE ARTICLES: NONE
SUPERSEDES: 94-9-7
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage And Emissions Warranty Coverage
OPERATION DESCRIPTION TIME
952105A Install Powertrain Control 1.0 Hr.
Module (PCM) Control Unit
Service kit
DEALER CODING
CONDITION
BASIC PART NO. CODE
12B528 79
OASIS CODES: 204000 206000, 698298