NO.27 CONSTANT VOLTAGE [G6]
id010395804300
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27 |
CONSTANT VOLTAGE |
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DESCRIPTION
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Incorrect constant voltage
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POSSIBLE CAUSE
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• Constant voltage circuit malfunction
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Diagnostic procedure
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STEP |
INSPECTION |
RESULTS |
ACTION |
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1
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Disconnect TP sensor connector.
Turn the ignition switch to the ON position.
Measure voltage between following TP sensor connector terminals:
• Constant voltage greater than 6.0 V?
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Yes
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Repair constant voltage circuit short to power in harness.
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No
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Go to the next step.
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2
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Is voltage across battery terminals greater than 10.5 V?
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Yes
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Go to the next step.
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No
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Inspect charging system.
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3
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Turn the ignition switch off.
Leave TP sensor connector disconnected.
Measure voltage between battery positive terminal and ground circuit at TP sensor connector.
Is voltage greater than 10.5 V and within 1.0 V of battery voltage?
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Yes
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Go to the next step.
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No
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Go to Step 8.
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4
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Turn the ignition switch to the ON position.
Attempt to access ECT PID.
Can ECT PID be accessed?
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Yes
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Go to Step 7.
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No
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Go to the next step.
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5
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Turn the ignition switch off.
Leave TP sensor connector disconnected.
Disconnect PCM connector.
Turn the ignition switch to the ON position.
Measure voltage between PCM connector terminals 1B and 2B.
Is voltage greater than 10.5 V?
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Yes
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Go to the next step.
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No
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Repair open circuit between PCM terminal 1B and main relay.
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6
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Leave TP sensor, and PCM connectors disconnected.
Disconnect M-MDS from the DLC-2.
Measure resistance between PCM connector terminals 2K and 2B.
Is resistance greater than 10,000 ohms?
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Yes
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Inspect for constant voltage at TP sensor connector again.
If constant voltage is still out of range, replace PCM.
• Open or short circuit in injector
• Leakage
• Injection volume
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No
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Repair constant voltage circuit short to ground.
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7
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Turn the ignition switch off.
Leave TP sensor connector disconnected.
Disconnect PCM connector.
Measure resistance between PCM connector terminal 2K and constant voltage circuit at appropriate sensor connector.
Is resistance less than 5.0 ohms?
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Yes
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Inspect for constant voltage at TP sensor connector again.
If constant voltage is still out of range, replace PCM.
• Open or short circuit in injector
• Leakage
• Injection volume
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No
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Repair open constant voltage circuit.
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8
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Reconnect TP sensor connector.
Turn the ignition switch to the ON position.
Attempt to access ECT PID.
Can ECT PID be accessed?
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Yes
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Go to the next step.
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No
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Go to Step 10.
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9
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Turn the ignition switch off.
Disconnect M-MDS from the DLC-2.
Disconnect PCM connector.
Measure resistance between ground circuit at appropriate sensor connector and PCM connector terminal 2D.
Is resistance less than 5.0 ohms?
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Yes
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Reconnect sensor connector.
Go to appropriate DTC test.
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No
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Repair open ground circuit.
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10
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Turn the ignition switch off.
Disconnect PCM connector.
Measure resistance between battery negative terminal and PCM terminals 2A, 2B and 2C.
Is each resistance less than 5.0 ohms?
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Yes
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Go to the next step.
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No
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Repair open ground circuit.
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11
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Turn the ignition switch off.
Measure resistance between ground circuit at following sensor connector and ground:
• ECT sensor
• O2S
• IAT sensor
• MAF sensor
• TP sensor
Is each resistance less than 5.0 ohms?
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Yes
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Ground circuits are normal.
Inspect for constant voltage at TP sensor connector again.
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No
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Inspect for open ground circuit.
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