Mazda CX-7 2007 Workshop Manual page 139

DTC P0193 Fuel pressure sensor circuit high input
FUEL PRESSURE SENSOR
FUEL PRESSURE SENSOR
WIRING HARNESS-SIDE CONNECTOR
C
Diagnostic procedure
STEP
1 VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
• Has the FREEZE FRAME DATA been
recorded?
2 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Verify related service repair information
availability.
• Is any related repair information available?
3 INSPECT FUEL PRESSURE SENSOR
CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect the fuel pressure sensor connector.
• Inspect for poor connection (such as damaged/
pulled-out pins, corrosion).
• Is there any malfunction?
4 INSPECT FUEL PRESSURE SENSOR SIGNAL
CIRCUIT FOR SHORT TO POWER SUPPLY
• Turn the ignition switch to the ON position
(Engine off).
• Measure the voltage between the fuel pressure
sensor terminal B (wiring harness-side) and
body ground.
• Is the voltage B+?
5 INSPECT FUEL PRESSURE SENSOR
• Inspect the fuel pressure sensor.
(See01-40-35 FUEL PRESSURE SENSOR
INSPECTION[L3 WITH TC].)
• Is there any malfunction?
ON-BOARD DIAGNOSTIC [L3 WITH TC]
3
C
3
5 4
B
3
7
A
2BE 2BA 2AW 2AS 2AO 2AK 2AG 2AC 2Y 2U 2Q 2M
2BF 2BB 2AX 2AT 2AP 2AL 2AH 2AD 2Z 2V 2R 2N
B A
2BG 2BC 2AY 2AU 2AQ 2AM 2AI 2AE 2AA 2W 2S 2O
2BH 2BD 2AZ 2AV 2AR 2AN 2AJ 2AF 2AB 2X 2T 2P
INSPECTION
PCM
6
2I
6
2R
6
2P
PCM
HARNESS SIDE CONNECTOR
Yes Go to the next step.
No Record the FREEZE FRAME DATA on the repair order,
then go to the next step.
Yes Perform the repair or diagnosis according to the available
repair information.
• If the vehicle is not repaired, go to the next step.
No Go to the next step.
Yes Repair or replace the terminal, then go to Step 8.
No Go to the next step.
Yes Repair or replace the wiring harness for a possible short to
power supply, then go to the Step 8.
No Go to the next step.
Yes Replace the fuel pressure sensor, then go to Step 8.
(See01-40-35 FUEL PRESSURE SENSOR REMOVAL/
INSTALLATION[L3 WITH TC].)
No Go to the next step.
2I 2E 2A
2J
2F 2B
2K 2G 2C
2L 2H 2D
ACTION
01-02–97
01-02