Suspect Injector; Camshaft Position (Cmp) Sensor Malfunction - Mazda B-Series 1997 Workshop Manual

ON-BOARD DIAGNOSIS SYSTEM
FT
PO300 Multiple injectors or camshaft
position sensor error
I
Diagnostic trouble
code No. PO340
1
CAMSHAFT POSITION (CMP) SENSOR MALFUNCTION
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S v m ~ t o m
1
Camshaft position sensor circuit failure
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INSPECTION ACTION
1
Does vehicle have a No Start symptom?
I
Yes Return to "CRANKS NORMALLY BUT WILL
NOT START" Diagnostic Troubleshooting
Guide chart No. 5.
1
No Go to next step.
1
Clear DTCs, start engine, and run engine up to 1500 RPM
for 10 seconds. Repeat two times. Retrieve Continuous
Memory DTCs.
Is DTC PO340 present?
For 2.3L: Go to step 5.
For 3.OU4.OL: Go to next step.
Intermittent poor connector or component
malfunction in CMP sensor circuit.
Repair or replace as necessary.
Key OFF and disconnect CMP sensor connector.
Key ON.
Is the voltage greater than 10.5 volts between the CMP
sensor connector terminal VPWR (R) and chassis ground?
Go to next step.
1
-
Repair open in VPWR
Go to step 10.
Key OFF. Leave CMP disconnected. Go to next step.
Is resistance between CMP sensor connector terminal
PWR GND (BNV) and ground less than 5.0 ohms?
Repair open in PWR GND circuit.
Go to step 10.
Key OFF.
Leave CMP disconnected.
Install breakout box, leave PCM disconnected.
Is resistance between CMP sensor connector terminal CID
(DUO) and CID test pin 85 at breakout box less than 5.0
ohms?
For 2.3 L, also measure the following:
Is resistance between SIG RTN circuit at CMP connector
and SIG RTN test pin 91 at breakout box less than 5.0
ohms?
Yes Go to next step.
Repair open in CID circuit.
Go to step 10.
Key OFF.
Leave PCM and CMP disconnected.
Go to next step.
Key
ON,
engine off.
Repair short in CID circuit.
Is the voltage less than 1.0 volt between CID test pin 85
Go to step 10.
and PWR GND test pins 511103 at breakout box?
Key OFF.
Leave PCM and CMP disconnected.
Is the resistance greater than 10,000 ohms between CID
test pin 85 and PWR GND test pins 511103 and SIG RTN
test pin 91 at breakout box?
Go to next step
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Repair short in CID circuit to GND or SIG
RTN.
Go to step 10.
Key OFF.
Leave CMP disconnected. Reconnect PCM to breakout
1
yes Go to next step.
Is the resistance greater than 500 ohms between CID test
pin 85 and PWR GND test pins 5111 03. VPWR test pins
Replace PCM.
Go to step 10.
71/97, SIG RTN test pin 9l'and IGN GND test pin 23 at
breakout box?