Mazda B-Series 1997 Workshop Manual page 440

ON-BOARD DIAGNOSIS SYSTEM
FT
STEP
Key OFF. Yes
Leave PCM and suspect injector connector disconnected.
Measure resistance between injector test pin(s) and test
pin 71 or 97,24,76 and 103 at breakout box.
Measure resistance between injector test pin at breakout
box and chassis ground.
No
Cvl.
Test pin
Cvl.
Test
in
1 75 4 100
2 101 5 73
3 74 6 99
INSPECTION ACTION
Inspect PCM for damaged or pushed out pins, corrosion,
Y e & - 10.
Is each resistance greater than 10,000 ohms?
Key OFF. Yes
Connect PCM to breakout box.
Connect standard 12 volt test lamp between test pin 71 or
97 and each injector test pin.
or loose wires.
Install breakout box, leave PCM disconnected.
Note: If misfire DTC(s) are displayed with fuel control
DTC(s), use misfire DTC(s) to determine the injector
circuit requiring testing.
Measure resistance between suspect injector test pin(s)
and test pin 71 or 97 at breakout box.
Q l A
Test
in Cvl.
Test pin
Cvl.
Test ?in
Cvl.
Test pin
1 75 4 100
1
- , -
No Go to next step.
Crank or start engine.
Does test lamp have a dim glovv while cranking or running
engine?
1 75 4 100
I
2 101 5 73
3 74 6 99
Is resistance between 11 .O-18.0 ohms?
Key OFF.
Leave PCM disconnected.
Disconnect injector harness connector at suspect injector.
Measure resistance between test pin 71 or 97 at breakout
box and VPWR pin at injector connector.
Measure resistance between injector test pin(s) at
breakout box and SIG pin at injector connector.
Cvl.
Test pin
Cvl.
Test pin
Go to step 25.
1 75 4 100
2 101 5 73
3 74 6 99
~
Is each resistance less than 5.0 ohms?
I
Go to next step.
Repair short circuit.
Go to step 25.
Go to next step.
Replace PCM.
Go to step 25.
Note: Use misfire DTC(s) displayed on prior DTC Yes
retrieval to determine at which cylinder(s) to check
compression.
Check compression. (Refer to Section B1, 82 or B3.)
Are cylinder compression readings within specifications?
For DTCs P1131, PI1 30, PI1 51 and P1150:
Go to next step.
For DTCs PI132 and P1152:
Go to step 17.
For DTCs P0171, P0172, PO174 and P0175:
Go
to
"Intermittent Concerns."
=
page FT-69
Misfire DTCs displayed with fuel control
DTCs:
Go to step 8 in "Misfire Detection Monitor."
- -
=
page FT-106
Repair as necessary.