DTC P0506:00, P151B:00 [SKYACTIV-G 2.5]

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2014 - Mazda6 - Engine

DTC P0506:00, P151B:00 [SKYACTIV-G 2.5]


DTC P0506:00	IAC system RPM lower than expected
DTC P151B:00	IAC system problem
DETECTION CONDITION	DTC P0506:00 The actual idle speed is lower than expected by 100 rpm for 14 s, when the brake pedal is depressed (brake switch is on). NOTE: If the atmospheric pressure is less than 72.3 kPa {0.737 kgf/cm², 10.5 psi} or the intake air temperature is below −10 °C {14 °F}, the PCM cancels the diagnosis of DTC P0506:00. Diagnostic support note This is a continuous monitor (CCM). The check engine light illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle. FREEZE FRAME DATA (Mode 2)/Snapshot data is available. DTC is stored in the PCM memory. DTC P151B:00 The PCM cannot control the idle speed toward the target idle speed during the KOER self test. Diagnostic support note The check engine light does not illuminate. FREEZE FRAME DATA (Mode 2)/Snapshot data is not available. DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	Not applicable
POSSIBLE CAUSE	A/C magnetic clutch malfunction Drive-by-wire control system malfunction Malfunction in injection amount measurement system (refer to DTC P0101:00) Purge solenoid valve malfunction Air cleaner element restricted Throttle body passage blockage Engine malfunction Insufficient engine compression Generator control circuit malfunction PCM malfunction
SYSTEM WIRING DIAGRAM	Not applicable

CAUTION:

Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.

Related PIDs


Item (definition)	Unit/Condition	Definition	Condition/Specification (Reference)
ALTF	%	Generator field current control duty value	Switch ignition ON (engine off): 0% Idle: Approx. 42% Racing (Engine speed is 2,000 rpm): Approx. 29%
ALTT V	V	Generator output voltage	Idle (no E/L): Approx. 14 V (This is internal calculation value and differs from terminal voltage)
TP1	V	TP sensor No.1	Accelerator pedal released: Approx. 1.11 V Accelerator pedal depressed: Approx. 4.59 V
TP1	%	TP sensor No.1	Accelerator pedal released: Approx. 22% Accelerator pedal depressed: Approx. 92%
TP2	V	TP sensor No.2	Accelerator pedal released: Approx. 3.92 V Accelerator pedal depressed: Approx. 0.41 V
TP2	%	TP sensor No.2	Accelerator pedal released: Approx. 22% Accelerator pedal depressed: Approx. 82%

Diagnostic Procedure


STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA HAS BEEN RECORDED Has the FREEZE FRAME DATA (Mode 2)/snapshot data been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA (Mode 2)/snapshot data on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line repair information availability. Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	VERIFY RELATED PENDING CODE AND/OR DTC Switch the ignition off, then ON (engine off). Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].) Are any other PENDING CODEs and/or DTCs present?	Yes	Go to the applicable PENDING CODE or DTC inspection. (See DTC TABLE [SKYACTIV-G 2.5].)
3		No	Go to the next step.
4	INSPECT A/C MAGNETIC CLUTCH OPERATION Turn the fan switch off. Is the magnetic clutch still on?	Yes	Perform the symptom troubleshooting “NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY”. (See NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [SKYACTIV-G 2.5].)
4		No	Go to the next step.
5	INSPECT DRIVE-BY-WIRE CONTROL SYSTEM MALFUNCTION Perform the Drive-by-wire Control System Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [SKYACTIV-G 2.5].) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 11.
5		No	Go to the next step.
6	INSPECT PURGE SOLENOID VALVE Inspect the purge solenoid valve. (See PURGE SOLENOID VALVE INSPECTION [SKYACTIV-G 2.5].) Is there any malfunction?	Yes	Replace the purge solenoid valve, then go to Step 11. (See PURGE SOLENOID VALVE REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)
6		No	Go to the next step.
7	INSPECT AIR CLEANER ELEMENT Remove the air cleaner element with the engine is running. Does the engine speed increase?	Yes	Clean or replace the air cleaner element, then go to Step 11.
7		No	Go to the next step.
8	INSPECT THROTTLE BODY PASSAGE Visually inspect the throttle body passage. Is the throttle body passage dirty and/or restricted?	Yes	Clean or replace the throttle body passage, then go to Step 11. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)
8		No	Go to the next step.
9	INSPECT ENGINE COMPRESSION Inspect the engine compression. (See COMPRESSION INSPECTION [SKYACTIV-G 2.5].) Are compression pressures within specification? Specification: Compression Standard: 954 kPa {9.73 kgf/cm², 138 psi} (300 rpm) Minimum: 763 kPa {7.78 kgf/cm², 111 psi} (300 rpm) Maximum difference between cylinders: 161 kPa {1.64 kgf/cm², 23.4 psi} (300 rpm) NOTE: Because the SKYACTIV-G 2.5 retards the intake valve closing timing, compression pressure is low.	Yes	Go to the next step.
9		No	Replace or overhaul the engine, then go to Step 11.
10	INSPECT GENERATOR CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY Apply the electrical load (such as blower fan, rear window defroster, or headlight). Does the engine speed increase?	Yes	Go to the next step.
10		No	Repair or replace the malfunctioning part according to the inspection results, then go to the next step.
11	VERIFY DTC TROUBLESHOOTING COMPLETED Always reconnect all disconnected connectors. Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [SKYACTIV-G 2.5].) Start the engine and warm it up completely. Depress the brake pedal for 14 s or more. Perform the Pending Trouble Code Access Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].) Is the PENDING CODE for this DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5].) Go to the next step.
11		No	Go to the next step.
12	VERIFY AFTER REPAIR PROCEDURE Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [SKYACTIV-G 2.5].) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 2.5].)
12		No	DTC troubleshooting completed.

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