SELF-DIAGNOSTIC SYSTEM
| Model | Body Code |
|---|---|
| Cherokee & Wagoneer | XJ |
| Comanche | MJ |
BODY CODE EXPLANATION
DIAGNOSIS & SYSTEM TESTING
- This is an interactive functional test of a particular system. During testing, DRB-II will provide instructions to technician. After task is performed, press ENTER key. A fault will be generated since the technician has performed a requested action and tester had not seen any indication from the diagnostic pins.
- Some tests such as engine coolant temperature sensor require longer periods before the circuit is automatically faulted (depending on ambient temperature).
- If a correct operating condition is not seen within a preprogrammed amount of time, the DRB-II keyboard is locked out. If there is a circuit problem, the test must time-out (the ENTER key cannot be used to force an error condition).
- After performing a SYSTEM TEST, if the DRB-II was unable to detect a fault with the system, the DRB-II will display VEHICLE PASSES ELECTRICAL TEST.
- One of the following alpha characters may appear as a prefix to a fault code. The character displayed can be used as an indication of where in the engine test sequence the fault was detected. Alpha prefixes are displayed only during a SYSTEM TEST. "A" (First Key Off) - Ignition switch in the OFF position. "B" (Key On Before Fuel Pump Drops Out) - Ignition switch in the ON position. Fuel Pump Drops Out refers to fuel pump relay being activated by the ECU and fuel pump being activated. If the ECU does not detect a crank signal within a few seconds after ignition is turned on, the ECU will automatically open ground circuit to fuel pump relay. This will disable fuel pump. "C" (Key On After Fuel Pump Drops Out) - Ignition switch is in the ON position after fuel pump relay has timed out (fuel pump off). "D" (First Crank) - The engine is cranking but not running. "E" (First Engine Start) - Engine idling. "F" (Second Key Off Before Fuel Pump Drops Out) - Ignition switch is in the OFF position for the second time before fuel pump relay has timed out. "G" (Second Key Off After Fuel Pump Drops Out) - Ignition switch is in the OFF position for the second time before fuel pump relay has timed out. "G" (Second Key On) - No text. "I" (Second Engine Start) - No text. "J" (Last Key Off) - No text. "X" (ECU Defined Faults) - Faults detected by ECU on-board diagnostics.
| DTC | Fault Condition |
|---|---|
| 1000 | Ignition Line Low. |
| 1001 | Ignition Line High. |
| 1002 | O2 Heater Low Line. |
| 1004 | Battery Voltage Low. |
| 1005 | Sensor Ground Line Out Of Limits. |
| 1013 | MPA Line High. |
| 1014 | Fuel Pump Line Low. |
| 1015 | Fuel Pump Line High. |
| 1016 | MAT Sensor Line Low. |
| 1017 | MAT Sensor Line High. |
| 1018 | No Serial Data. |
| 1020 | No Sync Pulse Seen. |
| 1021 | Engine Failed To Start Due To Mechanical, Fuel Or Ignition Problem. |
| 1022 | Start Line Low. |
| 1027 | ECU Sees Wide Open Throttle. |
| 1028 | ECU Does Not See Wide Open Throttle. |
| 1031 | ECU Sees Closed Throttle. |
| 1032 | ECU Does Not See Closed Throttle. |
| 1037 | TPS Circuit Reads Low. |
| 1038 | Park/Neutral Line High (A/T). |
| 1039 | Park/Neutral Line Low (A/T). |
| 1040 | Latched B+ Line Low. |
| 1041 | Latched B+ Line High. |
| 1042 | No Latched B+ 1/2 Volt Drop. |
| 1044 | Fault In Shift Light Circuit (M/T). |
| 1047 | Wrong ECU. |
| 1048 | Manual Vehicle Equipped With Automatic ECU. |
| 1049 | Automatic Transmission Vehicle Configuration. |
| 1050 | Idle RPM Less Than 500. |
| 1051 | Idle RPM Greater Than 2000. |
| 1052 | MAP Sensor Out Of Limits. |
| 1053 | Change In Map Reading Out Of Limits. |
| 1054 | Coolant Temperature Sensor Line Low. |
| 1055 | Coolant Temperature Sensor Line High. |
| 1056 | Inactive Coolant Temperature Sensor. |
| 1057 | Knock Circuit Shorted. |
| 1058 | Knock Value Out Of Limits. |
| 1059 | A/C Request Circuit Low. |
| 1060 | A/C Request Circuit High. |
| 1061 | A/C Select Circuit Low. |
| 1062 | A/C Select Circuit High. |
| 1063 | A/C Clutch Circuit Low. |
| 1064 | A/C Clutch Circuit High. |
| 1065 | O2 Sensor Reads Rich. |
| 1066 | O2 Sensor Reads Lean. |
| 1067 | Latch Relay Circuit Low. |
| 1068 | Latch Relay Circuit High. |
| 1069 | No tach. |
| 1073 | ECU Does Not See Speed Sensor. |
| 1200 | Defective ECU Or Short To Voltage. |
| 1201 | Injector Short To B+. |
| 1202 | All Injectors Shorted To Ground. |
| 1203 | Injector #1 Shorted To Ground. |
| 1204 | Injector #2 Shorted To Ground. |
| 1205 | Injector #3 Shorted To Ground. |
| 1206 | Injector #4 Shorted To Ground. |
| 1207 | Injector #5 Shorted To Ground. |
| 1208 | Injector #6 Shorted To Ground. |
| 1209 | All Injectors Open. |
| 1210 | Injector #1 Circuit Open. |
| 1211 | Injector #2 Circuit Open. |
| 1212 | Injector #3 Circuit Open. |
| 1213 | Injector #4 Circuit Open. |
| 1214 | Injector #5 Circuit Open. |
| 1215 | Injector #6 Circuit Open. |
| 1216 | No Voltage At ECU From A/C Relay. |
| 1217 | No Voltage At ECU From O2 Heater Relay. |
| 1218 | No Voltage At ECU From Power Latch Relay. |
| 1219 | No Voltage At ECU From Shift Light. |
| 1220 | No Voltage At ECU From EGR Solenoid. |
| 1222 | MPA Not Grounded. |
| 1223 | Checking For Open Injector Feed Circuits |
DTC IDENTIFICATION
Note. Compare fault code to appropriate diagnostic chart.
See also:
• TITANIA OXYGEN SENSOR TESTING