Ok - so I just got my 2000 XJ back from the shop. they replaced the AW4 with an AX15. It's throwing a CEL now, and I'm just going to fix it myself.

here's the CEL, and some info about it:

SYMPTOM
P1495-LEAK DETECTION PUMP SOLENOID CIRCUIT

WHEN MONITORED
Immediately after a cold start, with battery/ambient temperature between 4.4 °C (40 °F) . F and 32 °C (90 °F) . Coolant temperature within -12 °C (10 °F) of battery/ambient

SET CONDITION
The state of the solenoid circuit does not match the PCM's desired state.

POSSIBLE CAUSES
Wiring Harness Intermittent
Leak Detection Pump
Fused Ignition Switch Output
LDP Solenoid Control Circuit Shorted To Ground
LDP Solenoid Control Circuit Open
PCM

Leak Detection Pump System
The evaporative emission system is designed to prevent the escape of fuel vapors from the fuel system. Leaks in the system, even small ones, can allow fuel vapors to escape into the atmosphere. Government regulations require on-board testing to make sure that the evaporative (EVAP) system is functioning properly. The leak detection system tests for EVAP system leaks and blockage. It also performs self-diagnostics. During self-diagnostics, the Powertrain Control Module (PCM) first checks the Leak Detection Pump (LDP) for electrical and mechanical faults. If the first checks pass, the PCM then uses the LDP to seal the vent valve and pump air into the system to pressurize it. If a leak is present, the PCM will continue pumping the LDP to replace the air that leaks out. The PCM determines the size of the leak based on how fast/long it must pump the LDP as it tries to maintain pressure in the system.

They put a new ECU and injector harness, and there's a plug that is not plugged into anything directly behind the valve cover. It's a 2 wire plug with a white wire and a green/brown wire. I am wondering if maybe this plug should go to the EVAP/LDP system, but I don't know. If someone could check and see where this wire goes on their XJ or something that would be fantastic. I also have pictures of where the EVAP system goes. I think that maybe my year didn't come with it, but the 2001 ECU/harness did.

Pictures:

The unused plug



My evap/LDP system (right?)


a close up


a different XJ. notice the filter on the left of the A/C thing (i don't know what it's called)



so... any help would be appreciated. I don't want to just take the bulb out. I like everything to work correctly.

 

anyone?

 

guarantee you had one why are you not takingit back. must of forgot to put it back on

 

heres info on it http://www.jeep4x4center.com/knowledge-base/index.htm

 

what is that thing called?

 

OK, so I have 2 major problems to fix before I can register in September. I need to make the reverse light switch work and that LDP thing. First i'm going to work on the reverse light switch. I am pretty sure that the plug with 2 wires is for the backup light switch, but I don't know if it's coming from the tranny or from the chassis side. I think it's from the chassis. Can anyone with a manual 97-01 verify if that plug is the tranny or chassis side? It's red on the inside and has 2 male connectors.