Hi guys,
I'm replacing my o2 sensor and I want to check the wiring on the engine harness to make sure everything is functioning properly.
It is a 92, so it's got the OBD1 wiring.
On the engine harness, I have no idea which wire is which...I don't have the best lighting and they all seem black and identical except for one which is larger and light blue. Three of the four have some continuity to ground, and with the key on I can't find any that have 12 volts against the negative battery terminal; the large one has .17 volts according to my multimeter. I'm thinking something is wrong with the heater circuit.
If anyone knows, can someone tell me what each of the four wires on the plug is for, and also the location of any fuses or relays for the heater circuit? I've searched a fair amount and I see lots of references to Renix or OBD2 Jeeps, but not for early 90s models.
(The haynes manual engine control schematic for "91 and later" models shows what I assume is the main power lead for the heater circuit running through a "ballast resistor relay" which I have been unable to find. This schematic contains two fuel pump relays and two ballast resistor relays...doesn't make sense to me unless this is some kind of one-size-fits-all schematic)
Hopefully someone can shed some light so I can pass emissions by Wednesday!
Thanks- Rob
I'm replacing my o2 sensor and I want to check the wiring on the engine harness to make sure everything is functioning properly.
It is a 92, so it's got the OBD1 wiring.
On the engine harness, I have no idea which wire is which...I don't have the best lighting and they all seem black and identical except for one which is larger and light blue. Three of the four have some continuity to ground, and with the key on I can't find any that have 12 volts against the negative battery terminal; the large one has .17 volts according to my multimeter. I'm thinking something is wrong with the heater circuit.
If anyone knows, can someone tell me what each of the four wires on the plug is for, and also the location of any fuses or relays for the heater circuit? I've searched a fair amount and I see lots of references to Renix or OBD2 Jeeps, but not for early 90s models.
(The haynes manual engine control schematic for "91 and later" models shows what I assume is the main power lead for the heater circuit running through a "ballast resistor relay" which I have been unable to find. This schematic contains two fuel pump relays and two ballast resistor relays...doesn't make sense to me unless this is some kind of one-size-fits-all schematic)
Hopefully someone can shed some light so I can pass emissions by Wednesday!
Thanks- Rob