KOEO/KOER SELF-TEST [L8, LF]

• The self-test function consists of the KOEO (Key On Engine Off) self-test, performed when the ignition switch is turned to the ON position and the engine is stopped; and the KOER (Key On Engine Running) self-test, performed when idling. If a malfunction is detected when either self-test is executed, a DTC is displayed on the Mazda Modular Diagnostic System (M-MDS). Using the self-test function, the present malfunction or a successful repair is readily confirmed. Refer to the self-test function table for the corresponding DTCs.

• The KOEO self-test is a powertrain control system self-diagnosis, performed when the ignition switch is turned to the ON position and the engine is stopped. A KOEO self-test begins when the connected Mazda Modular Diagnostic System (M-MDS) sends an execute command to the PCM.

• As the KOEO self-test is performed, the PCM performs the inspection for set DTCs and if a malfunction is detected the DTC is displayed on the Mazda Modular Diagnostic System (M-MDS).

• The KOER self-test is a powertrain control system self-diagnosis, performed when the ignition switch is turned to the ON position and the engine is idling. A KOER self-test begins when the connected Mazda Modular Diagnostic System (M-MDS) sends an execute command to the PCM.

• As the KOER self-test is performed, the PCM performs the inspection for set DTCs and if a malfunction is detected the DTC is displayed on the Mazda Modular Diagnostic System (M-MDS).

DTC No.	Condition	Test condition
B1342	PCM malfunction	—	×
P0011^*1	CMP timing over-advanced	—	×
P0012^*1	CMP timing over-retarded	—	×
P0030	A/F sensor heater control circuit problem	×	×
P0031	A/F sensor heater circuit low input	×	×
P0032	A/F sensor heater circuit high input	×	×
P0037	HO2S heater circuit low input	×	×
P0038	HO2S heater circuit high input	×	×
P0069	Manifold absolute pressure/atmospheric pressure correlation	—	—
P0101	MAF sensor circuit range/performance problem	—	—
P0102	MAF sensor circuit low input	×	×
P0103	MAF sensor circuit high input	×	×
P0107	MAP sensor circuit low input	×	×
P0108	MAP sensor circuit high input	×	×
P0111	IAT sensor circuit range/performance problem	—	—
P0112	IAT sensor circuit low input	×	×
P0113	IAT sensor circuit high input	×	×
P0117	ECT sensor circuit low input	×	×
P0118	ECT sensor circuit high input	×	×
P0122	TP sensor No.1 circuit low input	×	×
P0123	TP sensor No.1 circuit high input	×	×
P0125	Excessive time to enter closed loop fuel control	—	—
P0130	A/F sensor circuit problem	×	×
P0131	A/F sensor circuit low input	×	×
P0132	A/F sensor circuit high input	×	×
P0133	A/F sensor circuit problem	—	—
P0134	A/F sensor no activity detected	—	×
P0138	HO2S circuit high input	×	×
P0140	HO2S no activity detected	—	×
P0222	TP sensor No.2 circuit low input	×	×
P0223	TP sensor No.2 circuit high input	×	×
P0300	Random misfire detected	—	×
P0301	Cylinder No.1 misfire detected	—	×
P0302	Cylinder No.2 misfire detected	—	×
P0303	Cylinder No.3 misfire detected	—	×
P0304	Cylinder No.4 misfire detected	—	×
P0327	KS circuit low input	×	×
P0328	KS circuit high input	×	×
P0335	CKP sensor circuit problem	—	—
P0340	CMP sensor circuit problem	—	—
P0403	EGR valve (stepping motor) circuit problem	×	×
P0421	Warm up catalyst system efficiency below threshold	—	—
P0443	Purge solenoid valve circuit problem	×	×
P0480	Cooling fan relay No.1 control circuit malfunction	×	×
P0481	Cooling fan relay No.2 control circuit malfunction	×	×
P0482	Cooling fan relay No.3 control circuit malfunction	×	×
P0500	VSS circuit problem	—	—
P0505	Idle speed control system problem	—	×
P0506	Idle speed control system RPM lower than expected	—	—
P0507	Idle speed control system RPM higher than expected	—	—
P0550	PSP switch circuit malfunction	—	—
P0564^*4	Cruise control switch circuit malfunction	×	—
P0571^*4	Brake switch circuit problem	×	—
P0601	PCM memory check sum error	×	×
P0602	PCM programming error	×	×
P0604	PCM random access memory (RAM) error	×	×
P0606	PCM processor	×	×
P0610	PCM vehicle options error	×	×
P0638	Throttle actuator control circuit range/performance problem	—	—
P0661	Variable intake air solenoid valve circuit low input	×	×
P0662	Variable intake air solenoid valve circuit high input	×	×
P0703	Brake switch input circuit problem	—	—
P0704^*2	Clutch pedal position (CPP) switch input circuit problem	—	—
P0850^*2	Neutral switch input circuit problem	—	—
P1260	Immobilizer system problem	×	—
P2009^*3	Variable tumble solenoid valve circuit low input	×	×
P2010^*3	Variable tumble solenoid valve circuit high input	×	×
P2088^*1	Oil control valve (OCV) circuit low	×	×
P2089^*1	Oil control valve (OCV) circuit high	×	×
P2096	Target A/F feedback system too lean	—	—
P2097	Target A/F feedback system too rich	—	—
P2101	Throttle actuator circuit range/performance	—	×
P2107	Throttle actuator control module processor error	—	×
P2108	Throttle actuator control module performance error	—	×
P2109	TP sensor minimum stop range/performance problem	—	×
P2112	Throttle actuator control system range/performance problem	—	×
P2119	Throttle actuator control throttle body range/performance problem	—	×
P2122	APP sensor No.1 circuit low input	×	×
P2123	APP sensor No.1 circuit high input	×	×
P2127	APP sensor No.2 circuit low input	×	×
P2128	APP sensor No.2 circuit high input	×	×
P2135	TP sensor No.1/No.2 voltage correlation problem	×	×
P2138	APP sensor No.1/No.2 voltage correlation problem	×	×
P2177	Fuel system too lean at off idle	—	×
P2178	Fuel system too rich at off idle	—	×
P2187	Fuel system too lean at idle	—	×
P2188	Fuel system too rich at idle	—	×
P2195	A/F sensor signal stuck lean	—	—
P2196	A/F sensor signal stuck rich	—	—
P2228	BARO sensor circuit low input	×	×
P2229	BARO sensor circuit high input	×	×
P2502	Charging system voltage problem	—	×
P2503	Charging system voltage low	—	×
P2504	Charging system voltage high	—	×
P2507	PCM B+ voltage low	×	×

DTC No.

Condition

Test condition

KOEO

KOER

B1342

PCM malfunction

—

P0011^*1

CMP timing over-advanced

—

P0012^*1

CMP timing over-retarded

—

P0030

A/F sensor heater control circuit problem

P0031

A/F sensor heater circuit low input

P0032

A/F sensor heater circuit high input

P0037

HO2S heater circuit low input

P0038

HO2S heater circuit high input

P0069

Manifold absolute pressure/atmospheric pressure correlation

—

P0101

MAF sensor circuit range/performance problem

—

P0102

MAF sensor circuit low input

P0103

MAF sensor circuit high input

P0107

MAP sensor circuit low input

P0108

MAP sensor circuit high input

P0111

IAT sensor circuit range/performance problem

—

P0112

IAT sensor circuit low input

P0113

IAT sensor circuit high input

P0117

ECT sensor circuit low input

P0118

ECT sensor circuit high input

P0122

TP sensor No.1 circuit low input

P0123

TP sensor No.1 circuit high input

P0125

Excessive time to enter closed loop fuel control

—

P0130

A/F sensor circuit problem

P0131

A/F sensor circuit low input

P0132

A/F sensor circuit high input

P0133

A/F sensor circuit problem

—

P0134

A/F sensor no activity detected

—

P0138

HO2S circuit high input

P0140

HO2S no activity detected

—

P0222

TP sensor No.2 circuit low input

P0223

TP sensor No.2 circuit high input

P0300

Random misfire detected

—

P0301

Cylinder No.1 misfire detected

—

P0302

Cylinder No.2 misfire detected

—

P0303

Cylinder No.3 misfire detected

—

P0304

Cylinder No.4 misfire detected

—

P0327

KS circuit low input

P0328

KS circuit high input

P0335

CKP sensor circuit problem

—

P0340

CMP sensor circuit problem

—

P0403

EGR valve (stepping motor) circuit problem

P0421

Warm up catalyst system efficiency below threshold

—

P0443

Purge solenoid valve circuit problem

P0480

Cooling fan relay No.1 control circuit malfunction

P0481

Cooling fan relay No.2 control circuit malfunction

P0482

Cooling fan relay No.3 control circuit malfunction

P0500

VSS circuit problem

—

P0505

Idle speed control system problem

—

P0506

Idle speed control system RPM lower than expected

—

P0507

Idle speed control system RPM higher than expected

—

P0550

PSP switch circuit malfunction

—

P0564^*4

Cruise control switch circuit malfunction

—

P0571^*4

Brake switch circuit problem

—

P0601

PCM memory check sum error

P0602

PCM programming error

P0604

PCM random access memory (RAM) error

P0606

PCM processor

P0610

PCM vehicle options error

P0638

Throttle actuator control circuit range/performance problem

—

P0661

Variable intake air solenoid valve circuit low input

P0662

Variable intake air solenoid valve circuit high input

P0703

Brake switch input circuit problem

—

P0704^*2

Clutch pedal position (CPP) switch input circuit problem

—

P0850^*2

Neutral switch input circuit problem

—

P1260

Immobilizer system problem

—

P2009^*3

Variable tumble solenoid valve circuit low input

P2010^*3

Variable tumble solenoid valve circuit high input

P2088^*1

Oil control valve (OCV) circuit low

P2089^*1

Oil control valve (OCV) circuit high

P2096

Target A/F feedback system too lean

—

P2097

Target A/F feedback system too rich

—

P2101

Throttle actuator circuit range/performance

—

P2107

Throttle actuator control module processor error

—

P2108

Throttle actuator control module performance error

—

P2109

TP sensor minimum stop range/performance problem

—

P2112

Throttle actuator control system range/performance problem

—

P2119

Throttle actuator control throttle body range/performance problem

—

P2122

APP sensor No.1 circuit low input

P2123

APP sensor No.1 circuit high input

P2127

APP sensor No.2 circuit low input

P2128

APP sensor No.2 circuit high input

P2135

TP sensor No.1/No.2 voltage correlation problem

P2138

APP sensor No.1/No.2 voltage correlation problem

P2177

Fuel system too lean at off idle

—

P2178

Fuel system too rich at off idle

—

P2187

Fuel system too lean at idle

—

P2188

Fuel system too rich at idle

—

P2195

A/F sensor signal stuck lean

—

P2196

A/F sensor signal stuck rich

—

P2228

BARO sensor circuit low input

P2229

BARO sensor circuit high input

P2502

Charging system voltage problem

—

P2503

Charging system voltage low

—

P2504

Charging system voltage high

—

P2507

PCM B+ voltage low