Mazda Factory OBD-II DTC P1295 Code Diagnostic Procedure

Mazda P1295	Injector multiple faults
DETECTION CONDITION	• The PCM monitors the fuel injectors No.1, No.2, No.3 and/or No.4. If the voltage at PCM each terminals remains high or low, the PCM determines that there is a fuel injectors No.1, No.2, No.3 and/or No.4 circuit problem.
POSSIBLE CAUSE	• Open circuit in the wiring harness between fuel injector No.1 terminal A and PCM terminal 118 • Open circuit in the wiring harness between fuel injector No.2 terminal A and PCM terminal 126 • Open circuit in the wiring harness between fuel injector No.3 terminal A and PCM terminal 125 • Open circuit in the wiring harness between fuel injector No.4 terminal A and PCM terminal 117 • Open circuit in the wiring harness between fuel injector No.1 terminal B and PCM terminal 101 • Open circuit in the wiring harness between fuel injector No.2 terminal B and PCM terminal 110 • Open circuit in the wiring harness between fuel injector No.3 terminal B and PCM terminal 109 • Open circuit in the wiring harness between fuel injector No.4 terminal B and PCM terminal 102 • Short to ground in the wiring harness between fuel injector No.1 terminal A and PCM terminal 118 • Short to ground in the wiring harness between fuel injector No.2 terminal A and PCM terminal 126 • Short to ground in the wiring harness between fuel injector No.3 terminal A and PCM terminal 125 • Short to ground in the wiring harness between fuel injector No.4 terminal A and PCM terminal 117 • Short to ground in the wiring harness between fuel injector No.1 terminal B and PCM terminal 101 • Short to ground in the wiring harness between fuel injector No.2 terminal B and PCM terminal 110 • Short to ground in the wiring harness between fuel injector No.3 terminal B and PCM terminal 109 • Short to ground in the wiring harness between fuel injector No.4 terminal B and PCM terminal 102 • Short to power supply in the wiring harness between fuel injector No.1 terminal A and PCM terminal 118 • Short to power supply in the wiring harness between fuel injector No.2 terminal A and PCM terminal 126 • Short to power supply in the wiring harness between fuel injector No.3 terminal A and PCM terminal 125 • Short to power supply in the wiring harness between fuel injector No.4 terminal A and PCM terminal 117 • Short to power supply in the wiring harness between fuel injector No.1 terminal B and PCM terminal 101 • Short to power supply in the wiring harness between fuel injector No.2 terminal B and PCM terminal 110 • Short to power supply in the wiring harness between fuel injector No.3 terminal B and PCM terminal 109 • Short to power supply in the wiring harness between fuel injector No.4 terminal B and PCM terminal 102 • Fuel injector No.1 malfunction • Fuel injector No.2 malfunction • Fuel injector No.3 malfunction • Fuel injector No.4 malfunction • PCM malfunction • Connector or terminal malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has the FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related service repair information availability. • Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT? • Connect the M-MDS to the DLC-2. • Clear the DTC from the PCM memory using the M-MDS. • Run the vehicle under the FREEZE FRAME DATA stored condition. • Is the same DTC present?	Yes	Go to the next step.
3		No	Intermittent concern exists. Perform the “INTERMITTENT CONCERNS TROUBLESHOOTING”.
4	INSPECT FUEL INJECTOR CONNECTOR FOR POOR CONNECTION • Turn the engine switch off. • Disconnect the fuel injector No.1, No.2, No.3, No.4 connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 10.
4		No	Go to the next step.
5	INSPECT FUEL INJECTOR CIRCUIT FOR SHORT TO POWER SUPPLY • Turn the engine switch to the ON position (Engine off). • Measure the voltage between the following terminals: ― Fuel injector No.1 terminal A (wiring harness-side) and body ground. ― Fuel injector No.1 terminal B (wiring harness-side) and body ground. ― Fuel injector No.2 terminal A (wiring harness-side) and body ground. ― Fuel injector No.2 terminal B (wiring harness-side) and body ground. ― Fuel injector No.3 terminal A (wiring harness-side) and body ground. ― Fuel injector No.3 terminal B (wiring harness-side) and body ground. ― Fuel injector No.4 terminal A (wiring harness-side) and body ground. ― Fuel injector No.4 terminal B (wiring harness-side) and body ground. • Is the voltage B+?	Yes	Repair or replace the wiring harness for a possible open circuit or short to ground, then go to Step 10.
5		No	Go to the next step.
6	INSPECT FUEL INJECTOR • Inspect the fuel injector No.1, No.2, No.3, No.4. • Is there any malfunction?	Yes	Replace the fuel injector, then go to Step 10.
6		No	Go to the next step.
7	INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the engine switch off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 10.
7		No	Go to the next step.
8	INSPECT FUEL INJECTOR CONTROL CIRCUIT FOR SHORT TO GROUND • Turn the engine switch off. • Disconnect the PCM connector. • Inspect for continuity between the following terminals: ― Fuel injector No.1 terminal A (wiring harness-side) and body ground. ― Fuel injector No.1 terminal B (wiring harness-side) and body ground. ― Fuel injector No.2 terminal A (wiring harness-side) and body ground. ― Fuel injector No.2 terminal B (wiring harness-side) and body ground. ― Fuel injector No.3 terminal A (wiring harness-side) and body ground. ― Fuel injector No.3 terminal B (wiring harness-side) and body ground. ― Fuel injector No.4 terminal A (wiring harness-side) and body ground. ― Fuel injector No.4 terminal B (wiring harness-side) and body ground. • Is there continuity?	Yes	Repair or replace the wiring harness for a possible short to ground, then go to Step 10.
8		No	Go to the next step.
9	INSPECT FUEL INJECTOR CONTROL CIRCUIT FOR OPEN CIRCUIT • Turn the engine switch off. • Inspect for continuity between the following terminals: ― fuel injector No.1 terminal A (wiring harness-side) and PCM terminal 118 (wiring harness-side). ― fuel injector No.1 terminal B (wiring harness-side) and PCM terminal 101 (wiring harness-side). ― fuel injector No.2 terminal A (wiring harness-side) and PCM terminal 126 (wiring harness-side). ― fuel injector No.2 terminal B (wiring harness-side) and PCM terminal 110 (wiring harness-side). ― fuel injector No.3 terminal A (wiring harness-side) and PCM terminal 125 (wiring harness-side). ― fuel injector No.3 terminal B (wiring harness-side) and PCM terminal 109 (wiring harness-side). ― fuel injector No.4 terminal A (wiring harness-side) and PCM terminal 117 (wiring harness-side). ― fuel injector No.4 terminal B (wiring harness-side) and PCM terminal 102 (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
9		No	Repair or replace the wiring harness for a possible open circuit, then go to the next step.
10	VERIFY THAT DTC P1295 TROUBLESHOOTING IS COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. • Run the vehicle under the FREEZE FRAME DATA stored condition. • Is the same DTC present?	Yes	Replace the PCM, then go to the next step.
10		No	Go to the next step.
11	VERIFY AFTER REPAIR PROCEDURE • Perform the after repair procedure. • Are any DTCs present?	Yes	Go to the applicable DTC inspection.
11		No	DTC troubleshooting completed.