How to Troubleshoot the CVT System
How to Check for DTCs with the Honda Diagnostic System (HDS)
When the transmission control module (TCM) or the powertrain control module (PCM) senses an abnormality in the input or output systems, the shift position indicator (A) in the gauge control module will usually blink as shown.
When the Honda Diagnostic System (HDS) is connected to the data link connector (DLC) located under the driver's side of the dashboard, and then the vehicle is turned to the ON mode, and the appropriate menu is selected, it will indicate the diagnostic trouble code (DTC).
If the shift position indicator or the malfunction indicator lamp (MIL) has been reported on, or if a driveability problem is suspected, follow this procedure:
2. |
Check for Pending or Confirmed DTCs with the HDS. |
3. |
Record the freeze data and the on-board snapshots for all PGM-FI DTCs and A/T DTCs. |
4. |
If there is a PGM-FI DTC, first check the PGM-FI system as indicated by the DTC. |
5. |
Clear the DTC and the data. |
6. |
Drive the vehicle for several minutes under the same conditions as those indicated by the freeze data or the on-board snapshot, and then recheck for the DTC. If the A/T DTC returns, go to the indicated DTC's troubleshooting. If the DTC does not return, there was an intermittent problem within the circuit. Make sure all pins and terminals in the circuit are tight. |
Symptom Troubleshooting Versus DTC Troubleshooting
Some symptoms will not set DTCs or cause the shift position indicator to blink. If the MIL was reported ON or the shift position indicator has been blinking, check for DTCs. If the vehicle has an abnormal symptom, and there are no DTCs stored, do the symptom troubleshooting. Check the list of probable cause(s) for the symptom, in the sequence listed, until you find the problem.
How to Troubleshoot Circuits at the TCM Connector (1.5 L engine)
1. |
Jump the SCS line with the HDS, and wait more than 1 minute.
NOTE: This step must be done to protect the TCM from damage. |
2. |
Disconnect the connector (A) by pushing the lock (B) and pulling the lever (C) in the numbered sequence shown. |
3. |
When diagnosis/troubleshooting is done at the TCM connector, use the terminal test port (A) above the terminal you need to check. |
4. |
Connect one side of the patch cord terminals (A) to a commercially available digital multimeter (B), and connect the other side of the terminals (C) to the pin probe male. |
5. |
Gently contact the pin probe (male) at the terminal test port from the terminal side. Do not force the tips into the terminals.
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For accurate results, always use the pin probe (male). |
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To prevent damage to the connector terminals, do not insert test equipment probes, paper clips, or other substitutes as they can damage the terminals. Damaged terminals cause a poor connection and an incorrect measurement. |
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Do not puncture the insulation on a wire. Punctures can cause or eventually lead to poor or intermittent electrical connections. | |
How to Troubleshoot Circuits at the PCM Connectors
NOTE: The PCM stays on for up to an hour after the vehicle is turned to the OFF (LOCK) mode. Jumping the SCS line after turning the vehicle to the OFF (LOCK) mode cancels this function. Disconnecting the PCM during this function, without jumping the SCS line first, can damage the PCM.
1. |
Jump the SCS line with the HDS, and wait more than 1 minute.
NOTE: This step must be done to protect the PCM from damage. |
3. |
When diagnosis/troubleshooting is done at the PCM connectors, use the terminal test port (A) above the terminal you need to check. |
4. |
1.5 L engine: Connect one side of the patch cord terminals (A) to a commercially available digital multimeter (B), and connect the other side of the terminal (C) to the pin probe male. |
5. |
Except 1.5 L engine: Connect one side of the patch cord terminals (A) to a commercially available digital multimeter (B), and connect the other side of the terminal (C) to a commercially available banana jack (Pomona Electronics Tool No. 3563 or equivalent) (D). |
6. |
Gently contact the pin probe (male) at the terminal test port from the terminal side. Do not force the tips into the terminals.
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For accurate results, always use the pin probe (male). |
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To prevent damage to the connector terminals, do not insert test equipment probes, paper clips, or other substitutes as they can damage the terminals. Damaged terminals cause a poor connection and an incorrect measurement. |
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Do not puncture the insulation on a wire. Punctures can cause or eventually lead to poor or intermittent electrical connections. | |
Clear A/T DTCs Procedure
2. |
Clear the DTC(s) on the HDS screen. |
OBD Status
The OBD STATUS shows the current system status of each DTC and all of the parameters. This function is used to see if the repair was successfully completed. The results of diagnostic tests for the DTC are displayed as:
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PASSED: The on-board diagnosis is successfully completed. |
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FAILED: The on-board diagnosis has completed but failed. |
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NOT COMPLETED: The on-board diagnosis was running but is out of the enable conditions of the DTC. |
How to End a Troubleshooting Session (required after any troubleshooting) (1.5 L engine)
1. |
Turn the vehicle to the OFF (LOCK) mode. |
2. |
Turn the vehicle to the ON mode, and wait for 30 seconds. |
3. |
Turn the vehicle to the OFF (LOCK) mode, and disconnect the HDS from the DLC. |
4. |
Start the engine, and warm it up to normal operating temperature (the radiator fan comes on twice). |
5. |
To verify that the problem is repaired, test-drive the vehicle for several minutes at speeds over 31 mph (50 km/h) or under the same conditions as those indicated by the freeze data. |
How to End a Troubleshooting Session (required after any troubleshooting)
3. |
Turn the vehicle to the OFF (LOCK) mode. |
4. |
Disconnect the HDS from the data link connector.
NOTE: The PCM is part of the immobilizer system. If you replace the PCM, you must register the PCM to the keyless access system. |
Failure Reproduction Technique
NOTE: Follow these rules while the vehicle is raised on a lift for the test-drive
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In case of the vehicle speed below 31 mph (50 km/h): Disable the VSA by pressing the VSA OFF button. |
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VSA DTC(s) may come on when test-driving on a lift. If the VSA system sets a DTC(s), clear the DTC(s) with the HDS. |
Self-Diagnosis
If the TCM or the PCM detects the failure of a signal from a sensor, a switch, a solenoid valve, or from another control unit, it stores a Pending or Confirmed DTC. Depending on the failure, a DTC is stored in either the first or second drive cycle. When a Confirmed DTC is stored, the TCM or the PCM blinks the shift position indicator and/or turns on the MIL by a signal sent to the gauge control module via F-CAN.
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One Drive Cycle Detection Method:
When an abnormality occurs in the signal from a sensor, a switch, a solenoid valve, or from another control unit, the TCM or the PCM stores a Pending or Confirmed DTC for the failure and blinks the shift position indicator and/or turns on the MIL immediately. |
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Two Drive Cycle Detection Method:
When an abnormality occurs in the signal from a sensor, a switch, a solenoid valve, or from another control unit in the first drive cycle, the TCM or the PCM stores a Pending DTC. The shift position indicator and the MIL do not turns on at this time. If the failure continues in the second drive cycle, the TCM or the PCM stores a Confirmed DTC and blinks the shift position indicator and/or turns on the MIL. |
Fail-Safe Function
When an abnormality occurs in the signal from a sensor, a switch, a solenoid valve, or from another control unit, the TCM or the PCM ignores that signal and substitutes a pre-programmed value for that signal to allow the CVT to continue operating. This causes a DTC to be stored and the shift position indicator to blink and/or the MIL to come on. The transmission may not shift normally during fail-safe operation. Do not run the test-driving diagnosis when the MIL is ON, or the shift position indicator is blinking. |