Mazda CX-7 2007 Workshop Manual page 80

DTC P0091[L3 WITH TC]
DTC P0091 Fuel pressure regulator control circuit low
• When the PCM turns the spill valve control solenoid valve off but the spill valve control solenoid valve
control circuit voltage is low, the PCM determines that the spill valve control solenoid valve control circuit
has malfunction.
MONITORING CONDITIONS
— The following conditions are met:
• Engine speed is 3,000 rpm or less.
DETECTION
• Battery voltage is 10 V or more.
CONDITION
Diagnostic support note
• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle.
• FREEZE FRAME DATA is available.
• DTCs are stored in the PCM memory.
• Spill valve control solenoid valve malfunction
• Open circuit in the wiring harness between high pressure fuel pump terminal A and PCM terminal 2F
• Open circuit in the wiring harness between high pressure fuel pump terminal B and PCM terminal 2G
POSSIBLE
• Short to ground in the wiring harness between high pressure fuel pump terminal A and PCM terminal 2F
CAUSE
• Short to ground in the wiring harness between high pressure fuel pump terminal B and PCM terminal 2G
• Connector or terminal malfunction
• PCM malfunction
(HIGH PRESSURE FUEL PUMP)
HIGH PRESSURE FUEL PUMP
WIRING HARNESS-SIDE CONNECTOR
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?
01-02–38
ON-BOARD DIAGNOSTIC [L3 WITH TC]
SPILL VALVE CONTROL
SOLENOID VALVE
3
A
4
3
B
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
5
6
2F
5
6
2G
PCM
WIRING 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.
id010239802600
2I 2E 2A
2J 2F 2B
2K 2G 2C
2H 2D
2L
ACTION