Dacia SuperNova (engine E7J). Service manual — part 32
E7J-A-2/60 ENGINE
17
IGNITION AND INJECTION
17 - 38
DIAGNOSING-INTERPRETING THE DEFECTS
OXYGEN PROBE HEATING CIRCUIT
1. Short-circuit at 12 V along the way to pin 63 of calculator
(heating oxygen probe command)
2. Short-circuit at mass along the way to pin 63 of calculator
(heating oxygen probe command)
3. Open circuit at 12 V along the way to pin 63 of calculator
(heating oxygen probe command)
4. Breakdown of the probe fuse heating power.
DEFECT
PRESENT OR
MEMORIZED
Conditions of breakdown detection by the calculator:
-start the engine
Conditions of performing the diagnosing:
-defect is present
-the defect has been memorized but is recorded in the “present” state.
SUGGESTIONS
Check the connection and the condition of the oxygen probe connector
Change the connector if necessary.
Check the heating resistance of the oxygen probe.
Change the oxygen probe if necessary.
Check the presence of +12V at pin A of the oxygen probe.
Remedy the electric circuit up to the actuating relay 238 if necessary
Connect the 90-way terminal-tester instead of the calculator and check the insulation,
the continuity and the absence of contact resistance along the circuit:
pin 63 of calculator
−> pin B of the oxygen probe.
Remedy if necessary.
The problem is not yet solved! Consequently, the injection calculator must be changed.
CAUTION! The destruction of the calculator has probably been caused by an
electric shock.
The cause of the destruction must be found before mounting a new
calculator.
22.
Erase defects memorized by the computer.
Perform the steps under “Suggestions” to confirm the repair.
Remedy other possible defects.
AFTER REPAIR
E7J-A-2/60 ENGINE
17
IGNITION AND INJECTION
17 - 39
DIAGNOSING-INTERPRETING THE DEFECTS
DETONATION SENSOR CIRCUIT
Breakdown of detonation signal
DEFECT
PRESENT OR
MEMORIZED
23.
Condition of breakdown detection by the calculator:
-do a route-test, with the engine heated and under high rotation
ratio.
Condition of performing the diagnosing:
-the defect is present
-the defect has been memorized but is recorded in the “present” state.
SUGGESTIONS
Check the connection and the condition of the detonation sensor
Change the connector if necessary.
Check the mounting of the detonation sensor on the engine block.
Tighten to the couple the detonation sensor.
Connect the 90-way terminal-tester instead of the calculator and check the insulation,
the continuity and the absence of contact resistance along the circuits:
pin 20 of calculator -> pin 1 of detonation sensor
pin 79 of calculator -> pin 2 of detonation sensor
pin 79 of calculator -> detonation sensor screening.
Remedy if necessary.
If the incident persists, change the detonation sensor.
The problem is not yet solved! Consequently, the injection calculator must be changed.
CAUTION! The destruction of the calculator has probably been caused by an
electric shock.
The cause of the destruction must be found before mounting a new
calculator.
Erase defects memorized by the computer.
Perform the steps under “Suggestions” to confirm the repair.
Remedy other possible defects.
AFTER
REPAIR
E7J-A-2/60 ENGINE
17
IGNITION AND INJECTION
17 - 40
DIAGNOSING-INTERPRETING THE DEFECTS
DEFECT
PRESENTOR
MEMORIZED
CAR SPEED INFORMATION
Car speed breakdown
Conditions of breakdown detection by the calculator:
-do a route-test, watching the car speed
-continue the route-test running at constant speed
-continue the route-test, running up-hill with the engine in idle
mode.
Conditions of performing the diagnosing:
-defect is present
-the defect has been memorized but is recorded in the “present” state.
SUGGESTIONS
Check the connection and the condition of the connectors along the way to the speed
translator.
Change the connectors if necessary.
Connect the 90-way terminal-tester instead of the calculator and check the insulation,
the continuity and the absence of contact resistance along the circuit:
pin 53 of calculator -> pin 1 of speed translator.
Remedy if necessary.
If the incident persists, change the speed translator and the mileage cable.
24.
Erase defects memorized by the computer.
Perform the steps under “Suggestions” to confirm the repair.
Remedy other possible defects.
AFTER
REPAIR
E7J-A-2/60 ENGINE
17
IGNITION AND INJECTION
17 - 41
DIAGNOSING-INTERPRETING THE DEFECTS
DEFECT
PRESENT
AIR-CONDITIONING COMPRESSOR RELAY COMMAND CIRCUIT
1. Open circuit or short-circuit to mass of the way to pin 10 of the
calculator
2. Short-circuit at 12 V along the way to pin 10 of the calculator
25.
Check the connection and the condition of the 584 compressor relay.
Change the connector if necessary.
Check the presence of +12 V at pole 3 of the 584 compressor relay.
Check fuse S6 in the engine compartment.
Remedy it if necessary.
Check the presence of mass at pole 2 of the584 compressor relay
Remedy if necessary.
Check that the insulation and the continuity of the circuit:
pin 10 calculator
♦
pole 2 of the 584 compressor relay.
Remedy if necessary.
Check the coil of the 584 relay.
Change relay if necessary.
The problem is not yet solved! Consequently, the injection calculator must be changed.
CAUTION! The destruction of the calculator has probably been caused by an
electric shock.
The cause of the destruction must be found before mounting a new
calculator.
Erase defects memorized by the computer.
Perform the steps under “Suggestions” to confirm the repair.
Remedy other possible defects.
AFTER REPAIR
Condition of breakdown detection by the calculator:
-take the contact, and wait for the dialogue with the tester to be lost,
then set the contact and resume dialogue.
Condition of performing the diagnosing:
-defect is present
-the defect has been memorized but is recorded in the “present” state.
Note: The calculator will command the compressor relay only if the con-
ditions are met which allow the good operational mode of the air-condi-
tioning installation (pressure of refrigerating agent in installation, work-
ing electric circuit between calculator and A.C. start switch).
Refer to directions of A.C installation repairing.
SUGGESTIONS
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