HD. Engine Falters or Dies When A/C Is Used

HD. Engine falters or dies when A/C is used

HD1




Mode 2
- Start the engine
Activate mode 2 according to D. Troubleshooting via the diagnostic socket. Bendix System [Regina/Rex-I]
^ Continue with Checking the A/C controls HD2.

HD2




Checking the A/C controls
- Disconnect the pressostat connector which is located on the reservoir.
- Switch on the fan.
- Move the A/C control to the A/C position.
The diagnostic system should respond with code 1-1-4.

If code 1-1-4 is received:
^ Checking the pressostat HD7.

If no code is received:
The control unit does not receive any signal from the A/C control when it is moved to the A/C position.
^ Connection of measurement box HD3.

HD3




Connection of measurement box
Connect the measurement box to Regina and check the chassis connections according to N1-N2. N. Measurement Box, Signal Description
^ Continue with Checking of the A/C control and wires HD4.

HD4




Checking of A/C controls and wires
- Ignition off.
Connect an ohmmeter between #15 and #5 (ground).
The ohmmeter should show approx. 35 ohms when the A/C control is on and infinite resistance when the AC control is off.

If the value Is OK:
^ Checking the signal from the A/C control HD5.

If the value differs:
^ Check the wiring for breakage and connector resistance according to CD. CD. Checking of Wiring

HD6




Checking the signal from the A/C control
- Connect the control unit to the measurement box.
- Insert fuse no.1.
- Start the engine.
- Switch on the fan.
Connect a voltmeter between #15 and #5 (ground).
The voltmeter should show battery voltage when the A/C control is on and approx. 0 V when the A/C control is off.

If the value is OK:
Intermittent fault.
^ Check the connectors for loose connection according to CD.

If the value differs:
^ Check the wiring for breakage and connection resistance according to CD.

HD7




Checking the pressostat
- Reconnect the pressostat.
The diagnostic system should respond with code 1-3-4 when the compressor is activated or deactivated.

If code 1-3-4 is received:
^ Adjust according to RE. Adjustment for insufficient A/C compensation. RE. Adjustment for Insufficient A/C Compensation

If no code is received:
The control unit does not receive any signal from the pressostat when the latter activates the compressor.
^ Connection of measurement box HD8.

HD8




Connection of measurement box
Connect the measurement box to Regina and check the chassis connections according to N1-N2. N. Measurement Box, Signal Description
^ Continue with Checking the signal from the A/C compressor HD10.

HD9




Checking the wires to the A/C compressor
- Ignition off.
Connect an ohmmeter between 14 and 5 (ground).
The ohmmeter should show approx. 3 ohms.

If the value is OK:
^ Checking the signal from the A/C compressor HD10.

If the value differs:
^ Check the wire for breakage and connection resistance according to CD. CD. Checking of Wiring

HD10




Checking the signal from the A/C compressor
- Connect the control unit to the measurement box.
- Insert fuse no.1.
- Start the engine.
- Switch on the fan and the A/C.
Connect a voltmeter between 14 and 5 (ground).
The voltmeter should show battery voltage when the A/C compressor is on and approx. 0 V when the A/C compressor is off.

If the value is OK:
^ Repeat Mode 2 HD1

If the value differs:
^ Checking the wires leading to the A/C compressor HD9.