P119

DTC P119: Part 1 0f 2:

DTC P119: Part 2 0f 2:

Fuel Injector Circuit:

CIRCUIT DESCRIPTION
This Powertrain Control Module (PCM) contains a General Field Effect Transistor Driver (GFD) that controls the eight fuel injector drivers. The GFD contains circuitry that is used to determine if there is a problem with any of the eight fuel injector circuits. If the GFD sees a short to ground or an open in any of the fuel injector circuits, the PCM sets Code P119, sets the second digit of parameter PD17 "HI" (1), and disables the faulty injector for the engine run cycle.

TEST CONDITIONS
1. Codes PO16 and P035 not set.
2. Engine cranked during ignition cycle.
3. Fuel pump feedback greater than 10 volts

FAILURE CONDITIONS
1. An injector circuit fault is detected for 0.5 second.

ACTION TAKEN
1. The "FAULTY" injector is disabled for the engine run cycle.

NOTES ON FAULT TREE
(Part 1 of 2)
1. Checking for intermittent. If second digit of PD17 is 0, the fault is not present. However, the PCM snapshot should show PD17 second digit as 1.
2. Checking for short to ground on CKT 339 or CKT 439.
3. Open may be caused at C1O1. Check terminal contact.
4. Using fuel injector override to pinpoint faulty injector circuit. Disabling one injector would normally create a noticeable difference in rpm and/or idle quality. Therefore, if one injector is already disabled due to a faulty injector circuit, disabling another should increase the rpm/idle quality change. But when the already disabled injector is selected in the override, no change should result, thus pinpointing the faulty injector.

(Part 2 of 2)
5. Checking for an open or short to ground in circuit to the PCM.
6. Check injector resistance at the engine temperature when the condition occurs. Injector resistance will normally increase with increasing temperature. Faulty injectors may measure OK cold, but not hot. Normal injector resistance is between 8 and 25 ohms.
7. Checking if problem is with injector or fuel rail harness.
8. Checking for a shorted injector or a short in the fuel rail hareness.
9. Checking for an open or high resistance in the fuel rail harness or an open or high resistance injector.