Fault location tree
| ALP 1 | No communication with the ECU |
INSTRUCTIONS
Nothing to report.
| Check the vehicle battery voltage. Repair if necessary. |
| Try the diagnostic tool on another control module in the vehicle, or on another vehicle. |
| Check the condition and correct connection of the two connectors of the electric power steering. Repair if necessary. Check the fuses for the electric power steering, engine and passenger compartment. Check the insulation, continuity and absence of parasitic resistance of the harness between the battery and the variable-assist steering control module:Black 2-way connector pin 1 → + battery Repair if necessary. |
| Carry out a diagnosis of the multiplexed network. |
| If the fault persists, contact your Techline. |
AFTER REPAIR
Carry out a check with the diagnostic tool.
| ALP 2 | Loss of vehicle power assistance without warning |
INSTRUCTIONS
Only consult this customer symptom after a complete check with the diagnostic tool.
| If the Electric Power Steering fuse blows or power supply is lost, the vehicle no longer has power assistance. The steering then behaves like a manual steering system: it can be steered while driving, even at low speed, but is very hard to turn when stationary. As it is no longer powered, the Electric Power Steering control module cannot light the warning light, so the driver is not alerted to the fault. The driver can then only detect the fault by feeling the loss of assistance through the steering wheel. |
| Check the condition of the fuses. Replace the fuses if necessary. |
| Check the condition of the Electric Power Steering connectors and repair them if necessary. Check the control module supply voltage: 2-way black connector pin 1 → Vehicle earth Repair if necessary. Check the insulation, continuity and absence of parasitic resistance of the harness between the Electric Power Steering control module and the dashboard warning lights: 8-way black connector pin 4 → Multiplex network |
| Make sure the steering column and steering rack are mechanically sound. Repair if necessary. |
| Make sure the front suspension components, such as the steering ball joints and strut mounts, are mechanically sound. Repair if necessary. |
| If the fault persists, contact your Techline. |
AFTER REPAIR
Carry out a check with the diagnostic tool.
| ALP 3 | Poor steering assistance feel |
INSTRUCTIONS
Nothing to report.
| Check the condition and pressure of the tyres, the condition of the joints and the front axle geometry. |
| Check the vehicle battery voltage and the condition of the battery terminals. Repair if necessary |
| Check the condition and presence of the Electric Power Steering power fuse. Repair if necessary. |
| Check the condition of the Electric Power Steering black 2-way power connector. Repair if necessary. |
| Make sure configuration CF088 "Control module calibration" matches the vehicle equipment: wheel size, vehicle type and engine. If necessary, configure the control module correctly using the diagnostic tool. |
| If the fault persists, contact your Techline |
AFTER REPAIR
Carry out a check with the diagnostic tool.
| ALP 4 | Steering wheel does not return to centre by itself at low speed |
INSTRUCTIONS
Note: The active return function is disabled
| Check the condition and pressure of the tyres, the condition of the joints and the front axle geometry. |
| Check the vehicle battery voltage. Repair if necessary. |
| Make sure the steering wheel angle is calibrated and consistent with the steering wheel position (state ET020 at 3 or 4). Repeat the steering wheel angle calibration if necessary (configuration CF085) |
| If the fault persists, contact your Techline. |
AFTER REPAIR
Carry out a check with the diagnostic tool.
| ALP 5 | Under-assistance at low speed and over-assistance at high speed |
INSTRUCTIONS
Nothing to report.
| Check the vehicle battery voltage. Repair if necessary. |
| Disconnect the control module connector and check the continuity, insulation and absence of parasitic resistance of the links: 8-way black connector pin 5 → Body Central Unit CAN L line Repair if necessary. |
| Carry out a multiplexed network test. Repair if necessary |
| Carry out a diagnosis of the Anti-lock Braking System to check conformity of PR003 "Vehicle speed". Repair if necessary. |
| If the fault persists, contact your Techline |
AFTER REPAIR
Carry out a check with the diagnostic tool.
| ALP 6 | Assistance too weak |
INSTRUCTIONS
Note: At the end of rotation travel, assistance is reduced after 5 seconds.
| Check the condition and pressure of the tyres, the condition of the joints and the front axle geometry. |
| Check the vehicle battery voltage. Repair if necessary. |
| Leave the Electric Power Steering without any demand for at least 1 hour. Make sure that nothing placed in the area around the Electric Power Steering causes it to overheat abnormally. |
| If the fault persists, contact your Techline. |
AFTER REPAIR
Carry out a check with the diagnostic tool.
| ALP 7 | Assistance available for 5 min after ignition off |
INSTRUCTIONS
Note: This problem may occur if the multiplexed engine operating status information is faulty.
| Check the vehicle battery voltage. Repair if necessary. |
| Disconnect the control module connector and check the continuity, insulation and absence of parasitic resistance of the links: 8-way black connector pin 5 → Body Central Unit CAN L line Repair if necessary. |
| Carry out a multiplexed network test. Repair if necessary. |
| Carry out a diagnosis of the injection system. Repair if necessary. |
| If the fault persists, contact your Techline. |
AFTER REPAIR
Carry out a check with the diagnostic tool.
| ALP 8 | Assistance available but "steering to be checked" warning message and service light steady or flashing at 8 Hz |
INSTRUCTIONS
Nothing to report.
| Check the vehicle battery voltage and the condition of the system connections. Repair if necessary. |
| Check the steering angle sensor configuration. If the sensor is not calibrated, perform a steering angle sensor learning procedure (procedure CF085). |
| If the fault persists, contact your Techline. |
AFTER REPAIR
Carry out a check with the diagnostic tool.
Test yourself
A quick Renault Megane quiz: every answer comes with an explanation and a link to the manual page.