Mazda B-Series 1997 Workshop Manual page 609

ELECTRONIC IGNITION SYSTEM
G
INSPECTION
I
ACTION
I
Key ON, engine OFF
Measure voltage between Pin 22 at 104 pin
breakout box and ground
Is voltage between I .O and 2.0 volts?
CKP sensor (Short to ground)
- -
Bias fault
Go to step 5
Was bias voltage reading in step 4 less
than 1.0 volt? Go to step 6
Key OFF
Disconnect PCM from 104 pin breakout box
Measure resistance between Pin 22 at 104 pin
repair short in CKP(-)
breakout box and ground
circuit to ground
Is resistance areater than 1 Ok ohms?
Key OFF
Disconnect PCM from 104 pin breakout box
Key ON, engine OFF
Measure voltage between Pin 22 at 104 pin
breakout box and ground
Is voltaae less than 0.5 volts?
1
Yes
1
Replace PCM
I 8 l
Crank the engine and measure voltage between Yes Go to diagnostic procedure
Pin 21 and Pin 22 at 104
in
breakout box
1 1
DTC P0351,0352.0353 or 0350
No
Is settled AC voltage reading greater than 0.4 volt?
Check connectors, repair short in CKP(-)
circuit to power
1
Yes
1
Replace PCM
Disconnect PCM from 104 pin breakout box
- -
Crank the engine and measure voltage between
Pin 21 and Pin 22 at 104 pin breakout box
Is settled AC voltaae readina areater than 0.4 volt?
1
10
1
K ~ ~ O F F
1
y e s GO tostep 14
Measure resistance between Pin 22 and Pin 21 at
I 1
104 pin breakout box
Is resistance between 300 and 800 ohms?
Was the resistance from step 10 less than
300 ohms?
I
Yes
/
Go to ster, 15 (Low resistance fault)
1
NO
/
GO to step 12 (High resistance fault)
Key OFF
Install El diagnostic harness to 60 pin breakout
box and CKP sensor and vehicle harness
Connect El diagnostic harness negative lead
to battery, leave positive lead disconnected
For 6 Cylinder Applications:
Use El (High data rate) 6 overlay
Set El diagnostic harness box type switch to
"416 cylinder" position
For 2.3L Dual Plug Applications:
Use El (High data rate) 2.3L Dual Plug overlay
Set El diagnostic harness box type switch to
"8 cylinder" position
Measure resistance between J31 at 60 pin
breakout box and Pin 21 at 104 pin breakout box
Is resistance less than 1050 ohms?