P1500
Symptom: CHECK GEARBOX indicator lamp on. The system's emergency operation program has been activated.
Battery voltage too high or too low.
Fault symptom
CHECK GEARBOX indicator lamp on. The system's emergency operation program has been activated.
Condition
Battery voltage is continually lower than 9 V or higher than 16 V for longer than 0.5 seconds.
Diagnostic procedure
1 Check the transmission control module's power supply
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Connect the Scan tool diagnostics instrument.
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Start the engine and run it at idling speed.
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Select "READ FUNCTIONS".
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Select "BATTERY VOLTAGE". The diagnostics instrument should show a reading of 12.5-14.0 V.
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Is the voltage reading OK?
Continue with step 6.
Continue with point 2.
2 Check the battery voltage
Take a voltage reading across the battery terminals. A reading of 12.5-14.0 V should be obtained.
Is the voltage reading OK?
Continue with point 3.
Continue fault diagnosis as described in Service Manual 3:1 "Electrical system" and then proceed to point 6.
3 Check the voltage difference
Compare the voltage with the diagnostics instrument reading. The difference should be less than 0.5 V.
Is the difference less than 0.5 V?
Continue with step 6.
Continue with point 4.
4 Check the grounding point
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Disconnect the cables from grounding point G34P (LHD) or G33S (RHD), clean the contact surfaces and reconnect the cables.
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Connect the Scan tool diagnostics instrument.
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Start the engine and run it at idling speed.
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Select "READ FUNCTIONS".
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Select "BATTERY VOLTAGE". The diagnostics instrument should show a reading of 12.5-14.0 V.
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Is the difference in voltage still more than 0.5 V?
Continue with point 5.
Continue with step 6.
5 Check the control module's connection to ground and power supply
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Start the engine and run it at idling speed.
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Connect a voltmeter to • pin 17 and B+<0.5 V. • pin 18 and B+<0.5 V • pin 22 and B-<0.1 V • pin 35 and B-<0.1 V
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Are all voltage readings OK?
Continue with step 6.
Investigate the cause and rectify the fault. Continue with point 6.
6 Final check
Clear the diagnostic trouble code, drive the car on test at varying engine loads and speeds for 5 minutes and check whether the diagnostic trouble code recurs.
Does the diagnostic trouble code recur?
Continue with
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The remedial action taken was correct.
