Mazda MX-6 1998, Руководство по ремонту

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TROUBLESHOOTING [ENGINE CONTROL KL]
DTC P1650
Power steering pressure (PSP) switch out of self-test range
DESCRIPTION • DTC P1650 indicates PSP signal is out of self-test range
[Possible Cause]
• PSP switch/shorting bar damaged • PCM damaged
• PSP switch circuit open or shorted to GND
STEP
INSPECTION ACTION
1 VERIFY ELECTRICAL FUNCTION
• Key on, engine running.
• View PSP PID while turning steering wheel
back and forth.
• Does PSP PID Indicate voltage Low/High
o r H igh/Low ?
Yes Intermittent poor connection or component malfunction
(REPAIR or REPLACE as necessary).
No Go to next step.
2 CHECK PSP SWITCH OPERATION
• Key off.
• Start engine and let idle in Park/Neutral.
• Install dwell tacho tester.
• Disconnect PSP switch connector and
inspect end for damage. Service as
necessary.
• Jumper PSP signal circuit to ground at PSP
connector.
• Does engine rpm increase?
Yes REPLACE PSP switch.
VERIFY repair.
No REMOVE jumper.
Go to next step.
3 CHECK CONTINUITY OF PSP CIRCUITS
• Key off.
• PSP switch disconnected.
• Disconnect PCM. Inspect for damaged or
pushed out pins, corrosion, loose wires,
etc. Service as necessary.
• Install breakout box. Leave PCM
disconnected.
• Measure resistance between Test Pin 31 at
breakout box and PSP circuit at PSP
switch connector.
• Is each resistance less than 5.0 ohms?
Yes Go to next step.
No
SERVICE open circuit.
REMOVE breakout box.
RECONNECT all components.
RERUN OBD Test.
4
CHECK PSP CIRCUIT FOR SHORT
• Key off.
• PSP switch disconnected.
• Breakout box installed, leave PCM
disconnected.
• Measure resistance between Test Pin 31
and Test Pin 91 at breakout box.
• Measure resistance between Test Pin 31 at
breakout box chassis ground.
• Is either resistance less than 10,000
ohms?
Yes SERVICE short in harness.
REMOVE breakout box.
RECONNECT all components.
VERIFY repair.
No Go to next step.
5
CHECK PSP SWITCH RESISTANCE
• Key off.
• PSP switch disconnected.
• Start engine and let idle in Park/Neutral.
• Measure resistance between PSP switch
terminals while turning steering wheel.
• Is resistance less than 5.0 ohms?
Yes
REPLACE PCM.
REMOVE breakout box.
RECONNECT all components.
RERUN OBD Test.
No REPLACE PSP switch.
REMOVE breakout box.
RECONNECT all components.
RERUN OBD Test.
01-01B -123