TROUBLESHOOTING GUIDE - 32 MIL ALWAYS ON / 33 MIL NEVER ON

F-72spec table

32 MIL ALWAYS ON

DESCRIPTION: • Self-Diagnosis Checker does not indicate Malfunction Code No. but MIL always ON

NOTE

[TROUBLESHOOTING HINTS] • Short circuit in wiring harness • ECU malfunction

STEP	INSPECTION	Result	ACTION
1	Disconnect (Y/B) wire from ECU and check if MIL goes off [See fig1]	Yes	Replace ECU (page F-127)
1		No	Check for short circuit in wiring between combination meter and ECU (page F-8)

INSPECTIONDisconnect (Y/B) wire from ECU and check if MIL goes off [See fig1]

ResultYes

ACTIONReplace ECU (page F-127)

INSPECTION

ResultNo

ACTIONCheck for short circuit in wiring between combination meter and ECU (page F-8)

DESCRIPTION: • Self-Diagnosis Checker indicates Malfunction code No. of input device but MIL never ON • Other indicator and warning lamps OK

NOTE

[TROUBLESHOOTING HINTS] • Bulb burned out • Open circuit in wiring harness • ECU malfunction

STEP	INSPECTION	Result	ACTION
1	Ground (Y/B) wire at ECU with jumper wire and check if MIL comes on [See fig2]	Yes	Check connection condition of ECU connector (page F-128). → If OK, replace ECU (page F-127). → If not OK, repair ECU connector (page F-127)
1		No	Check if bulb is OK. → If OK, repair (Y/B) wire between ECU and combination meter (page F-8). → If not OK, replace bulb (page T-33)

INSPECTIONGround (Y/B) wire at ECU with jumper wire and check if MIL comes on [See fig2]

ResultYes

ACTIONCheck connection condition of ECU connector (page F-128). → If OK, replace ECU (page F-127). → If not OK, repair ECU connector (page F-127)

INSPECTION

ResultNo

ACTIONCheck if bulb is OK. → If OK, repair (Y/B) wire between ECU and combination meter (page F-8). → If not OK, replace bulb (page T-33)