Mazda B-Series 1997 Workshop Manual page 615

ELECTRONIC IGNITION SYSTEM
STEP INSPECTION ACTION
7
Caution:
(2.3L and 3.OL) When performing this test
procedure, remove
El
diagnostic connector
from CKP sensor and vehicle harness
Reconnect vehicle harness to CKP sensor
Connect El diagnostic harness positive lead to
battery
Connect incandescent test lamp between J1 and
J10 at 60 pin breakout box
Crank the engine
Does lamp blink consistently and brightly (one blink
per engine revolution)?
Caution:
(2.3L and 3.OL) When performing this test
procedure, remove El diagnostic connector
from CKP sensor and vehicle harness
Reconnect vehicle harness to CKP sensor
Connect incandescent test lamp between J1 and
J18 at 60 pin breakout box
Crank the engine
Does lamp blink consistently and brightly (one blink
Der enaine revolution)?
Key OFF
Disconnect coil from coil tee, leave El diagnostic
harness connected to vehicle harness coil
connector
Measure resistance between J7 and J10 at
60 pin breakout box
Yes
/
Go to step 38
Key
OFF
Disconnect PCM from vehicle harness
connector
Measure resistance between J7 and J10 at
60 pin breakout box
Is resistance greater than 1 O k ohms?
Key OFF
Disconnect coil from coil tee, leave El diagnostic
harness connected to vehicle harness coil
connector
Measure resistance between J7 and J18 at
60 pin breakout box
Is resistance less than 2k ohms?
- - - - -
Key OFF
Disconnect PCM from vehicle harness
connector
Measure resistance between J7 and J18 at
60 pin breakout box
Is resistance areater than 1 O k ohms?
Is resistance less than 2k ohms?
I I
I
Key OFF
Disconnect PCM from vehicle harness
connector
Key ON, engine OFF
Measure voltage between J10 and J7 at
60 pin breakout box
Is voltage less than 0.5 volt?
- .
Key OFF
Disconnect PCM from vehicle harness
connector
Key ON, engine OFF
Measure voltage between J18 and J7 at
60 pin breakout box
,
Is voltaoe less than 0.5 volt?
/
Yes
No
Yes
-
No
-
Yes
No
Replace PCM
Check connectors, repair short in c o ~ l circuit to ground
Go to step 40
-
.~
Replace left coil pack
Replace PCM
Check connectors, repair short in coil circuit to ground
Replace PCM
-
- - -
Check connectors, repair short in coil circuit to power
- p p - p p - - p
Replace PCM
Check connectors, repair short in coil circuit to power