DTC Troubleshooting: P1041 (71-12), P1042 (72-12), P1043 (73-12), P1044 (74-12), P2146 (177-5), P2149 (177-6)

DTC P1041: No. 1 Cylinder Injector Circuit Shorted DTC P1042: No. 2 Cylinder Injector Circuit Shorted DTC P1043: No. 3 Cylinder Injector Circuit Shorted DTC P1044: No. 4 Cylinder Injector Circuit Shorted DTC P2146: No. 1 and No. 4 Cylinder Injector Circuit Malfunction DTC P2149: No. 2 and No. 3 Cylinder Injector Circuit Malfunction Turn the ignition switch ON (II). Clear the DTC with the HDS. Do the INJECTOR TEST in the INSPECTION MENU with the HDS. Check for Temporary DTCs or DTCs with the HDS. Is DTC P1041, P1042, P1043, P1044, P2146 and/or P2149 indicated?
YES | - | Go to Step 5 .
NO | - | Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the injectors and the ECM.■
Turn the ignition switch OFF, and wait 30 seconds. Disconnect the injector 2P connector from the problem cylinder. At the injector side, measure resistance between the injector 2P connector terminals No. 1 and No. 2. Is there about 0.2 Ω or less at room temperature?
YES | - | Go to Step 8 .
NO | - | Go to Step 15 .
Disconnect ECM connector No. 1 (96P). |

Check for continuity between injector 2P connector terminals No. 1 and No. 2 (see table).
PROBLEM CYLINDER | DTC | INJECTOR TERMINAL NAME | ECM TERMINAL No. (CONNECTOR) | WIRE COLOR
--- | --- | --- | --- | ---
No. 1 | P1041 P2146 | INJ1+ | 25 (No. 1) | BLK
INJ1− | 74 (No. 1) | BRN
No. 2 | P1042 P2149 | INJ2+ | 2 (No. 1) | WHT/RED
INJ2− | 49 (No. 1) | RED
No. 3 | P1043 P2149 | INJ3+ | 1 (No. 1) | RED/BLK
INJ3− | 73 (No. 1) | BLU
No. 4 | P1044 P2146 | INJ4+ | 26 (No. 1) | GRN
INJ4− | 56 (No. 1) | YEL
Is there continuity?
YES | - | Repair short in the wires of the injector, then go to Step 16 .
NO | - | Go to Step 10 .

Check for continuity between injector 2P connector terminals No. 2 and body ground (see table).
PROBLEM CYLINDER | DTC | INJECTOR TERMINAL NAME | ECM TERMINAL No. (CONNECTOR) | WIRE COLOR
--- | --- | --- | --- | ---
No. 1 | P1041 P2146 | INJ1+ | 25 (No. 1) | BLK
No. 2 | P1042 P2149 | INJ2+ | 2 (No. 1) | WHT/RED
No. 3 | P1043 P2149 | INJ3+ | 1 (No. 1) | RED/BLK
No. 4 | P1044 P2146 | INJ4+ | 26 (No. 1) | GRN
Is there continuity?
YES | - | Repair short in the wire between the injector and the ECM, then go to Step 16 .
NO | - | Go to Step 11 .

Check for continuity between injector 2P connector terminals No. 1 and body ground (see table).
PROBLEM CYLINDER | DTC | INJECTOR TERMINAL NAME | ECM TERMINAL No. (CONNECTOR) | WIRE COLOR
--- | --- | --- | --- | ---
No. 1 | P1041 P2146 | INJ1− | 74 (No. 1) | BRN
No. 2 | P1042 P2149 | INJ2− | 49 (No. 1) | RED
No. 3 | P1043 P2149 | INJ3− | 73 (No. 1) | BLU
No. 4 | P1044 P2146 | INJ4− | 56 (No. 1) | YEL
Is there continuity?
YES | - | Repair short in the wire between the injector and the ECM, then go to Step 16 .
NO | - | Go to Step 12 .
Turn the ignition switch ON (II). |

Measure voltage between injector 2P connector terminal No. 2 and body ground (see table).
PROBLEM CYLINDER | DTC | INJECTOR TERMINAL NAME | ECM TERMINAL No. (CONNECTOR) | WIRE COLOR
--- | --- | --- | --- | ---
No. 1 | P1041 P2146 | INJ1+ | 25 (No. 1) | BLK
No. 2 | P1042 P2149 | INJ2+ | 2 (No. 1) | WHT/RED
No. 3 | P1043 P2149 | INJ3+ | 1 (No. 1) | RED/BLK
No. 4 | P1044 P2146 | INJ4+ | 26 (No. 1) | GRN
Is there battery voltage?
YES | - | Repair short to power in the wire between the injector and the ECM, then go to Step 16 .
NO | - | Go to Step 11 .

Measure voltage between injector 2P connector terminals No. 1 and body ground (see table).
PROBLEM CYLINDER | DTC | INJECTOR TERMINAL NAME | ECM TERMINAL No. (CONNECTOR) | WIRE COLOR
--- | --- | --- | --- | ---
No. 1 | P1041 P2146 | INJ1− | 74 (No. 1) | BRN
No. 2 | P1042 P2149 | INJ2− | 49 (No. 1) | RED
No. 3 | P1043 P2149 | INJ3− | 73 (No. 1) | BLU
No. 4 | P1044 P2146 | INJ4− | 56 (No. 1) | YEL
Is there battery voltage?
YES | - | Repair short to power in the wire between the injector and the ECM, then go to Step 16 .
NO | - | Go to Step 21 .
Replace the problem injector. Reconnect all connectors. Turn the ignition switch ON (II). Reset the ECM with the HDS. Do the INJECTOR TEST in the INSPECTION MENU with the HDS. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated?
YES | - | If DTC P1041, P1042, P1043, P1044, P2146 and/or P2149 are indicated, check for poor connections or loose terminals at the injector and the ECM, then go to Step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO | - | Troubleshooting is complete.■
Update the ECM if it does not have the latest software, or substitute a known-good ECM. Do the INJECTOR TEST in the INSPECTION MENU with the HDS. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated?
YES | - | If DTC P1041, P1042, P1043, P1044, P2146 and/or P2149 are indicated, check for poor connections or loose terminals at the injector and the ECM, then go to Step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO | - | If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. ■