Cherokee Xj Error Codes
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light flashes. Start by turning the ignition key to the last stop before it starts, on and off three times within 5 seconds ending in the on position on the third time, ( i.e. on, off, on, off then on and jeep cherokee obd codes leave ), ( OBDII 96-97, 4 times ) . The check engine light will start to flash jeep obd1 codes quickly with a small pause in between then a medium pause to indicate the next number in the to digit number and then a long pause jeep xj check engine light codes before the next set of flashing for the next code. If all is well you will get a code 55 which would read like this: 5 fast flashes, medium pause then a further 5 flashes. This is how all codes end with is jeep grand cherokee engine codes this 55 code if you have air conditioning or with a code 33 without and any other codes would have been before it separated by a long pause. The codes will remain after this test so you can cycle through it as many times as it takes to read them. After a problem has gone the code will be removed after 50 on off key cycles or if the battery left disconnected over night which will cause a code 12 though. Code Description
1995 Jeep Grand Cherokee Check Engine Codes
Most likely reason 11 No crank signal to computer. Fault in wiring between crankshaft position sensor (CPS) and ECM ( PCM or computer ) or faulty CPS. 12 Battery disconnected. Battery or power to the ECM disconnected in the last 50 key cycles. 13 MAP Sensor. No change in Manifold Absolute Pressure (MAP) between engine off and on. Check circuit and MAP sensor. 14 MAP Sensor. MAP sensor voltage too high or low. Check circuit and sensor. 15 Speed sensor or circuit. No signal detected from speed sensor. Check circuit and sensor. 17 Engine running too cold. Wrong or faulty thermostat. Check also sensor and circuit for fault. 21 Oxygen sensor or circuit. O2 sensor or wiring faulty. 22 Coolant sensor or circuit. Check temp sensor and wiring. 23 Intake air temp or circuit. Check air temp sensor and wiring. 24 Throttle Position Sensor (TPS) Check TPS sensor and wiring. 25 Idle Air Control circuit (IAC) Check IAC sensor and wiring. 26 Injector circuit resistance. Peak injector current has not been reached or injector circuits have resistance 27 Fuel injector control circuit. Will need specialist diagnostics. 31 Evaporative control circuit. Fault in fuel evaporative control circuit or hoses. 33 Air conditioning clutch relay. Wiring to A/C clutch fault. 34 Cruise control circuit. Fault in circuit. 35 Cooling fan relay. Check relay and circuit. 36 Air switch solenoid circuit. Air switch solenoid circuit (non-turbo) or the waste gate solenoid on turbocharged models 37 Torque converter clutch. Needs specialist or dealer diagnostics. 41 Alternator field switch. Switch not
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Jeep Cherokee Check Engine Light
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use today. OBD is an electronic system designed to control engine functions and diagnose engine problems or component failures, as well as minimize emissions. OBD-II, a new standard introduced in cars built after January 1, 1996, provides almost complete http://www.wjjeeps.com/faultcodes.htm engine control and also monitors parts of the chassis, body and accessory components, as well as the diagnostic control network of the vehicle. OBD-II equipped vehicles have a connector located in the passenger compartment, usually accessible from the driver's seat (under the dash above the hood release lever in the Grand Cherokee WJ). A cable is plugged into the OBD-II connector and connected to a scanning tool. This can range from a simple hand-held check engine meter that provides a coded read-out of the various diagnostic functions, up to a large console computer-based unit costing thousands of dollars. Fault codes usually appear after the "Check Engine" light has come on. The data provided by the OBD-II system can sometimes pinpoint the specific component that has malfunctioned, saving substantial service time and cost. Scanning OBD-II signals can also provide important information when purchasing a used vehicle. Recent introductions of less costly check engine light scanning devices have allowed home mechanics and small shops accessibility to OBD-II signals to use them for their own testing and repairs. Malfunction Indicator Lamp (MIL) In the Grand Cherokee WJ, the MIL gives an indication to the vehicle operator when the Powertrain Control Module (PCM) has recorded a Diagnostic Trouble Code (DTC) for an On-Board Diagnostics II (OBDII) emissions-related circuit or component malfunction. The MIL is controlled by a transistor on the instrument cluster circuit board based upon cluster programming and electronic messages received by the cluster from the PCM over the Programmable Communications Interface (PCI) data bus. The MIL bulb is completely controlled by the instrument cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the bulb will always be off when the ignition switch is in any position except On or Start. The bulb only illuminates when it is provided a path to ground by the instrument cluster transistor. The instrument cluster will turn on the MIL for the following reasons: BULB TEST - Each time the ignition switch is turned to the On position the MIL is illuminated for about three seconds as a bulb test. MIL LAMP-ON MESSAGE - Each time the cluster receive