ECD SYSTEM(for Swirl Control Valve), Diagnostic DTC:P013A and P013B

Refer to DTC P0030 (Click here).

Refer to DTC P0030 (Click here).

1. Air fuel ratio sensors functional check

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON and turn the GTS on.

   3. Start the engine.

   4. Pre-check

      Tip:

      • The air fuel ratio sensors can only emit a valid signal when at operating temperature and when the engine is running (after reaching the end of the dew point temperature). The air fuel ratio sensor upstream of the oxidation catalytic converter reaches operating readiness when the coolant temperature is between 70°C (158°F) and 80°C (176°F).

      • The air fuel ratio sensor downstream of the catalytic converter needs a few minutes more than the upstream air fuel ratio sensor to achieve operating readiness.

      • Even if the engine is already at operating temperature when it started, it still takes a few minutes for the air fuel ratio sensors to become operational.

      • If electrical faults are recorded for the air fuel ratio sensors, operating readiness is not granted and the functional check is prohibited. In this case, the electrical faults must be repaired first.

      1. Enter the following menus: Powertrain / Engine and ECT / Data List / Adaption state for Lambda Sensor 1 and Adaption state for Lambda Sensor 2.

      2. Read the values.

         OK

         Greater than zero

      3. Enter the following menus: Powertrain / Engine and ECT / Data List / Lambda Signal Valid State for Lambda Sensor 1 and Lambda Signal Valid State for Lambda Sensor 2.

      4. Read the values.

         OK

         Greater than zero

   5. Plausibility check

      Tip:

      The following criteria are important for checking the plausibility of air-fuel ratios:

      • When in a steady state, the air-fuel ratios upstream and downstream of the oxidation catalytic converter are virtually identical.

      • The air-fuel ratios fluctuate within the ranges shown in the examples.

      • The signal from the air fuel ratio sensor downstream of the oxidation catalytic converter follows the signal from the upstream air fuel ratio sensor after a certain time delay (approximately 1 second).

      • Erratic changes to the air-fuel ratio are signaled virtually immediately by the air fuel ratio sensors. Heavy fouling of the upstream air fuel ratio sensor can mean that its signals are delayed by up to two seconds. In this situation, the signal from the air fuel ratio sensor upstream of the oxidation catalytic converter is sent after the signal from the downstream air fuel ratio sensor.

      1. Enter the following menus: Powertrain / Engine and ECT / Data List / O2 Sensor Lambda Bank 1 Sensor 1 and O2 Sensor Lambda Bank 1 Sensor 2.

      2. Read the values while the engine is idling.

         Standard value

         Idling (warm up the engine): 1.5 to 8

         Tip:

         The following conditions for normal functioning affect the air-fuel ratios:

         • When exhaust-gas recirculation is active, the proportion of fresh air during combustion is lower, leading to a lower air-fuel ratio.

         • When the auxiliary function is operated, fuel consumption increases during combustion, leading to a lower air-fuel ratio.

         • The following illustration shows how conditions for normal functioning can affect the air-fuel ratios when idling.

         

         Table 2. Text in Illustration

         *a	Air-fuel ratios when exhaust-gas recirculation active	*b	Air-fuel ratios when exhaust-gas recirculation off
         *c	Signal from air fuel ratio sensor upstream of oxidation catalytic converter	*d	Signal from air fuel ratio sensor downstream of oxidation catalytic converter
         *e	No auxiliary functions activated	*f	Successive activation of auxiliary functions
         *g	Auxiliary function activated	*h	Air-fuel ratios level during idling with no auxiliary functions activated
         *i	Air-fuel ratios level during idling with auxiliary functions activated	*j	[Air-fuel ratio]
         *k	[Second]	-	-

      3. Fully depress the accelerator pedal, and then measure the values after releasing the pedal.

         Standard value

         1 to 32

         Tip:

         The air-fuel ratios behave as follows when the accelerator is pressed:

         1. Operating the accelerator pedal assembly: The engine acceleration and corresponding increase in fuel quantity lowers the air-fuel ratios.

         2. Keeping the accelerator pedal assembly pressed: Keeping the accelerator pedal assembly pressed (engine runs at maximum speed) stabilizes the air-fuel ratios a level considerably higher than the idling level.

         3. Releasing the accelerator pedal assembly: The fuel injection is switched off until the engine returns to idling speed. During this phase, the air-fuel ratios increase to a maximum value of 32.7 until the idling speed is reached and fuel injection is resumed.

         • The following illustration shows how the air-fuel ratios can behave when the accelerator is pressed.

         • When exhaust-gas recirculation is turned off, the air-fuel ratios during the idling phase will be somewhat higher than those shown in this example.

         

         Table 3. Text in Illustration

         *a	Accelerator pedal assembly signal	*b	Engine speed
         *c	Signal from air fuel ratio sensor upstream of oxidation catalytic converter	*d	Signal from air fuel ratio sensor downstream of oxidation catalytic converter
         *e	Air-fuel ratios level during overrun fuel cut-off	*f	Air-fuel ratios level at maximum speed
         *g	Air-fuel ratios level immediately after complete operation of accelerator pedal assembly	*h	[Air-fuel ratio]
         *i	[rpm]	*j	[%]
         *k	[Second]	-	-