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TSB 95-5-21 Fuse "E" Inoperative - ABS Light On - Back-Up Lamps Inoperative - DRLs Inoperative - MIL On - Speedometer Inoperative
Publication Date: MARCH 13, 1995

LIGHT TRUCK: 1992-1995 BRONCO, F-150-350 SERIES

ISSUE: On some vehicles the HO2S wires in the 12A690 (subassembly of the 14B060 battery cable) harness may become chafed and the vehicle could exhibit any one of the following conditions:
ABS light on
Speedometer inoperative
Back-up lamps inoperative
Daytime running lamps inoperative
Trailer battery charge relay inoperative
MIL on, displaying Codes: 172, 173 or 41 for HO2S failure
Inadvertent PCM Self-Test

ACTION: Replace the damaged wire harness and HO2S sensor. Refer to the following procedure for service details.

SERVICE PROCEDURE:
Disconnect negative battery cable.
Disconnect the solenoid terminal and positive battery cable from the starter.
Pull the cable downward to inspect the 12A690 harness for chafing, pinholes, etc. If necessary, remove the convolute and tape from the 12A690 harness located next to the lower RH side engine mount.
If the 12A690 harness is damaged, replace the 14B060 assembly (F5TZ-14300-EA) and the HO2S sensor (F4UZ-9F472-A).
Inspect Fuse "E" and replace if necessary (D9ZZ-14526-D).
Clear all codes stored in memory.
Retest and verify the concern has been resolved.

PART NUMBER - PART NAME
D9ZZ-14526-D Fuse - 15 Amp
F5TZ-14300-EA Harness Assembly
F4UZ-9F472-A HO2S Sensor

OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage
OPERATION - DESCRIPTION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - TIME
950521A - - - - - Replace Harness Assembly, HO2S Sensor And Fuse "E" (If Overloaded) - 0.7 Hr.