Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Service Information: Diagnostics
All diagnostics of the ECVT are carried out via the EMS. Using DISplus, the EMS can request actions from the GIU and monitor these actions for the correct performance.
A requirement has been identified for the GIU to perform an integrity check on its output drives. This mode will be engaged as part of the end of line testing during production, and also for the technician performing diagnostic testing. In response to these signals, the GIU shall perform the following:
- Perform a test on the LED drives.
- Test both the clutch and pressure solenoids.
- Attempt to move the motor through a complete cycle.
Once the operation of the EMS 2000 has been established, the GIU operation should be established. The CAN link between the GIU and the EMS 2000 can be verified by observing the LCD display in the instrument cluster. The display should change in accordance with the gear lever selector and is an indication that the selector switches are operational and the drive from the EMS 2000 to the instrument cluster is operational.
If the ratio control motor is suspected to be faulty the following procedure can be carried out to confirm its state:
- Turn the ignition off and wait 5 minutes for the EMS 2000 to power down.
- Unplug the connector from the GIU and using a multi-meter measure phase coils across pin 5 & 6 and then 7 & 8. The reading should be between 18-30 Ohms.
- When a reading cannot be obtained, try reading the phase coils on the transmission connections by probing the connection directly on the transmission.
- When readings can not be obtained at the transmission, the motor is assumed to be faulty.
| Fault/Symptom | Most Likely Causes |
|---|---|
| Transmission stays in highest ratio. Vehicle pulls away as normal, but engine speed does not rise as normal |
|
| Vehicle pulls away and accelerates sluggishly |
|
| Transmission stays in lowest ratio. Vechicle pulls away as normal, but engine speed rises rapidly to around 6000 rpm at 30 KPH |
|
| Engine speed stuck at a constant speed for most driving conditions |
|
| No Creep in D |
|
| High engine load in D |
|
| No center console LEDs with ignition On |
|
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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