Fuel Pump (Fp) Primary Or Secondary Circuit - Mazda B-Series 1997 Workshop Manual

FT
ON-BOARD DIAGNOSIS SYSTEM
crank engine.
Is FPF PID off during crank?
Diagnostic trouble code FUEL PUMP (FP) PRIMARY OR SECONDARY CIRCUIT
No. P0230, P0231, PO232
p p p p .
No Replace PCM.
Go to ster, 23.
Symptom
Does engine start?
FP primary circuit failure and/or secondary circuit malfunction.
--
Yes
No
If DTC PO231 was present:
Replace PCM.
For all others:
Go to next step.
- -
If DTC PO231 was present:
Go to step 18.
For all others:
Go to step 13.
STEP INSPECTION
1
2
3
4
5
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6
7
~
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ACTION
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Inspect PCM, fuel pump or fuel pump relay connectors or Continuous Memory DTC P0232:
damaged or pushed out pins, corrosion or loose wires.
Repair or replace if necessary.
For Continuous Memory DTC PO231 :
Follow direction in Action.
Memory DTC P0230:
r all other DTCs:
Disconnect fuel pump relay.
Key ON, engine off.
Is voltage between VPWR at fuel pump relay connector on
I
No
Repair open in VPWR circuit between PCM
power distribution box and chassis ground greater than
1 power relay and fuel pump relay.
10.5 volts?
Go to step 23.
I
--
Key OFF. Yes Go to next step.
Measure resistance between VPWR pin and FUEL PUMP
pin of fuel pump relay.
Resistance should be between 40 and 120 ohms.
-
~
~~-
Measure resistance between FP pin and both
power-to-pump and B+ pins of fuel pump relay.
Resistance should be greater than 10,000 ohms.
Are all resistances OK?
Key OFF.
Leave fuel pump relay disconnected.
Install breakout box, leave PCM disconnected.
Key ON, engine off.
Is voltage between FP test pin 80 at breakout box and
chassis ground less than 1.0 volt?
Key OFF.
Measure resistance between FP test pin 80 and PWR
GND test pin 51, 103 and 91 at breakout box.
Is resistance greater than 10,000 ohms?
- -
- -
Key
OFF.
Is resistance between FP at fuel pump relay connector on
power distribution box and FP test pin 80 at breakout box
less than 5.0 ohms?
-
Key OFF.
Remove breakout box and reconnect PCM and relay.
Connect scan tool or NGS to data link connector.
.
Key ON, engine off.
Access FPF PID.
Key ON, engine off.