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Activation
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Activation applicable to
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Description
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Use
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AC Relay
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When crankshaft is stationary
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Processor control of the transistor that grounds the circuit.
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Checking control module output, electrical circuitry and actuator operation. When the output is active, the electromagnetic clutch should engage. Otherwise, use a test lamp to find the defective lead and/or component.
The refrigerant circuit must also be OK.
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Charge Air By Pass Solenoid
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When crankshaft is stationary
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Processor control of the transistor that grounds the circuit.
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Control of control module output, electric circuit and actuator operation. When the output is active, the electromagnetic clutch should connect the bypass valve control line to the nipple on the clutch body, before the throttle. Otherwise, use a test lamp to locate the faulty lead/component.
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Main Relay
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When crankshaft is stationary
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Processor control of the transistor that grounds the circuit.
Note: When the ignition is turned ON, the main relay is always activated. To deactivate the relay it must first be activated "ON" and then "OFF".
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Checking control module output, electrical circuitry and actuator operation. When the output is active, a test lamp connected to pins 6 and 10 of the ignition control module's connector should light up. Otherwise, use a test lamp to find the defective lead and/or component.
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Fuel Pump Relay
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When the crankshaft is stationary. Activation time is limited to 30 seconds.
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Processor control of the transistor that grounds the circuit.
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Checking control module output, electrical circuitry and actuator function. When the output is active, the pump should be heard. Otherwise, use a test lamp to find the defective lead/component.
Also check the fuel pressure if necessary.
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Preheating O2S 1
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When crankshaft is stationary
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Processor control of the transistor that grounds the circuit.
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Checking control module output and electric circuitry. When the output is active, pin 1 of the sensor should be grounded. Otherwise, use a test lamp to find the defective lead/component. Connect the test lamp to pin 2 and B+ when performing this test.
Note: The preheating element is supplied with current from the fuel pump relay. On activation of preheating, the fuel pump relay is not active and therefore the sensor will not be warm. If necessary, the pump circuit can be supplied with current via fuse 19 during activation.
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Injector Cyl 1
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When the crankshaft is stationary. Activation time is limited to 30 seconds.
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Processor control of the transistor that grounds the circuit.
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Checking control module output, electrical circuitry and actuator function. When the output is active, the valve should be heard. Otherwise, use a test lamp to find the defective lead/component.
Also check the fuel flow if necessary.
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Injector Cyl 2
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When the crankshaft is stationary. Activation time is limited to 30 seconds.
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Processor control of the transistor that grounds the circuit.
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Checking control module output, electrical circuitry and actuator function. When the output is active, the valve should be heard. Otherwise, use a test lamp to find the defective lead/component.
Also check the fuel flow if necessary.
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Injector Cyl 3
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When the crankshaft is stationary. Activation time is limited to 30 seconds.
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Processor control of the transistor that grounds the circuit.
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Checking control module output, electrical circuitry and actuator function. When the output is active, the valve should be heard. Otherwise, use a test lamp to find the defective lead/component.
Also check the fuel flow if necessary.
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Injector Cyl 4
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When the crankshaft is stationary. Activation time is limited to 30 seconds.
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Processor control of the transistor that grounds the circuit.
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Checking control module output, electrical circuitry and actuator function. When the output is active, the valve should be heard. Otherwise, use a test lamp to find the defective lead/component.
Also check the fuel flow if necessary.
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Ignition Coil Cyl 1
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When the crankshaft is stationary. If an injector has been activated, the engine must be started and then switched off before activation will be allowed.
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Processor control of the transistor that grounds the circuit.
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Control of control module output, electric circuit and actuator operation. Connect test spark plugs. When the output is active, a spark should be produced. Otherwise, use a test lamp to locate the faulty lead/component.
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Ignition Coil Cyl 2
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When the crankshaft is stationary. If an injector has been activated, the engine must be started and then switched off before activation will be allowed.
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Processor control of the transistor that grounds the circuit.
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Control of control module output, electric circuit and actuator operation. Connect test spark plugs. When the output is active, a spark should be produced. Otherwise, use a test lamp to locate the faulty lead/component.
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Ignition Coil Cyl 3
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When the crankshaft is stationary. If an injector has been activated, the engine must be started and then switched off before activation will be allowed.
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Processor control of the transistor that grounds the circuit.
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Control of control module output, electric circuit and actuator operation. Connect test spark plugs. When the output is active, a spark should be produced. Otherwise, use a test lamp to locate the faulty lead/component.
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Ignition Coil Cyl 4
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When the crankshaft is stationary. If an injector has been activated, the engine must be started and then switched off before activation will be allowed.
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Processor control of the transistor that grounds the circuit.
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Control of control module output, electric circuit and actuator operation. Connect test spark plugs. When the output is active, a spark should be produced. Otherwise, use a test lamp to locate the faulty lead/component.
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Throttle Motor PWM Test (30s)
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When the crankshaft is stationary, the control module input for pedal position sensor 1 is grounded and the input for pedal position sensor 2 is open (connect a jumper lead between pins 4 and 1 in the throttle body's connector).
The main relay must also supply control module pin 1 with current.
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Each motor lead can be supplied with B+ or ground to change the polarity. The processor reverses the polarity of the motor leads alternately at 50% PWM.
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Checking control module output and electrical circuitry. Connect the test lamp to pins 5 and 10 of the throttle body's connector. During the test the lamp should show a green and red light alternately.
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Fuel Pump Flow Test (30s).
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When crankshaft is stationary
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The fuel pump is activated for 30 seconds. For reasons of safety, a button on the diagnostic tool must be held down throughout the test.
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Checking that the flow rate is within the prescribed limits at high fuel adaptation values and that the pressure and the fuel pressure regulator's pressure response are OK at high or low fuel adaptation values.
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Injector 1 Flow Test (30s).
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When crankshaft is stationary
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The injector is activated for 30 seconds. For reasons of safety, a button on the diagnostic tool must be held down throughout the test. The fuel pump must first be started by connecting diagnostics cable 83 93 886 between fuse 8 upper pin and 19 lower pin.
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WARNING. This test must NEVER be activated with the injectors mounted in the intake manifold. Checking that the flow rate is within the prescribed limits if uneven fuel distribution between the cylinders is suspected or in connection with high fuel adaptation values.
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Injector 2 Flow Test (30s).
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When crankshaft is stationary
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The injector is activated for 30 seconds. For reasons of safety, a button on the diagnostic tool must be held down throughout the test. The fuel pump must first be started by connecting diagnostics cable 83 93 886 between fuse 8 upper pin and 19 lower pin.
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WARNING. This test must NEVER be activated with the injectors mounted in the intake manifold. Checking that the flow rate is within the prescribed limits if uneven fuel distribution between the cylinders is suspected or in connection with high fuel adaptation values.
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Injector 3 Flow Test (30s).
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When crankshaft is stationary
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The injector is activated for 30 seconds. For reasons of safety, a button on the diagnostic tool must be held down throughout the test. The fuel pump must first be started by connecting diagnostics cable 83 93 886 between fuse 8 upper pin and 19 lower pin.
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WARNING. This test must NEVER be activated with the injectors mounted in the intake manifold. Checking that the flow rate is within the prescribed limits if uneven fuel distribution between the cylinders is suspected or in connection with high fuel adaptation values.
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Injector 4 Flow Test (30s).
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When crankshaft is stationary
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The injector is activated for 30 seconds. For reasons of safety, a button on the diagnostic tool must be held down throughout the test. The fuel pump must first be started by connecting diagnostics cable 83 93 886 between fuse 8 upper pin and 19 lower pin.
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WARNING. This test must NEVER be activated with the injectors mounted in the intake manifold. Checking that the flow rate is within the prescribed limits if uneven fuel distribution between the cylinders is suspected or in connection with high fuel adaptation values.
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Canister Purge Valve
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When the crankshaft is stationary. Activation time is limited to 60 seconds.
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Processor control of the transistor that grounds the circuit with 8 Hz PWM. The pulse ratio is adjustable.
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Checking control module output, electrical circuitry and actuator function. When the output is active, the valve should be heard. Otherwise, use a test lamp to find the defective lead/component.
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Charge Air Control Valve
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When the crankshaft is stationary. Activation time is limited to 60 seconds.
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Processor control of the transistor that grounds the circuit with 32 Hz PWM. The pulse ratio is adjustable.
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Control of control module output, electric circuit and actuator operation. When the output is active, the valve should be heard operating. Otherwise, use a test lamp to locate the faulty lead/component. Check also that C and W are constantly in connected to each other and that R is closed but opens gradually when the PWM rises.
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Reset Misfire Counters
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When crankshaft is stationary
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The Misfire and Knock counters are set to 0 for all cylinders.
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Set to zero before running on test.
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