KOEO/KOER SELF-TEST[ZJ, ZY, Z6]

• 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 an abnormality 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
P0011	CMP-timing over-advanced	—	×
P0012	CMP-timing over-retarded	—	×
P0031	Front HO2S heater control circuit low	×	×
P0032	Front HO2S heater control circuit high	×	×
P0037	Rear HO2S heater control circuit low	×	×
P0038	Rear HO2S heater control circuit high	×	×
P0101	MAF sensor circuit range/performance problem	—	—
P0102	MAF sensor circuit low input	×	×
P0103	MAF 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	×	×
P0121	TP sensor circuit range/performance problem	—	—
P0122	TP sensor circuit low input	×	×
P0123	TP sensor circuit high input	×	×
P0125	Insufficient coolant temperature for closed loop fuel control	—	—
P0132	Front HO2S circuit high voltage	×	×
P0133	Front HO2S circuit slow response	—	—
P0134	Front HO2S circuit no activity detected	—	×
P0138	Rear HO2S circuit high voltage	×	×
P0140	Rear HO2S circuit no activity detected	—	×
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	—	—
P0420	Catalyst system efficiency below threshold	—	—
P0443	Purge solenoid valve circuit problem	×	×
P0480	Cooling fan No.1 control circuit problem	×	×
P0500	VSS circuit problem	—	—
P0505	IAC system problem	—	×
P0506	IAC system RPM lower than expected	—	—
P0507	IAC system RPM higher than expected	—	—
P0511	IAC circuit problem	×	×
P0550	PSP switch circuit problem	—	—
P0602	PCM programming error	×	×
P0610	PCM vehicle options error	×	×
P0660^*1	Variable intake air circuit/open	×	×
P0668	PCM temperature sensor circuit low input	×	×
P0669	PCM temperature sensor circuit high input	×	×
P0703	Brake switch input circuit problem	—	—
P0704	CPP switch input circuit problem	—	—
P0850	Neutral switch input circuit problem	—	—
P1260	Immobilizer system problem	×	—
P1384	Variable valve timing control system operation error	—	×
P2006^*3	Variable tumble control stuck close	—	×
P2008	Variable tumble control circuit/open	×	×
P2088	Variable valve timing control circuit low	×	×
P2089	Variable valve timing control circuit high	×	×
P2096	Target A/F feedback system too lean	—	—
P2097	Target A/F feedback system too rich	—	—
P2177	System too lean off idle	—	×
P2178	System too rich off idle	—	×
P2187	System too lean at idle	—	×
P2188	System too rich at idle	—	×
P2195	Front HO2S signal stuck lean	—	—
P2196	Front HO2S signal stuck rich	—	—
P2228^*2	BARO sensor circuit low input	×	×
P2229^*2	BARO sensor circuit high input	×	×
P2502	Charging system voltage problem	—	×
P2503	Charging system voltage low	—	×
P2504	Charging system voltage high	—	×
P2507	PCM power input signal low	×	×

DTC No.

Condition

Test condition

KOEO

KOER

P0011

CMP-timing over-advanced

—

P0012

CMP-timing over-retarded

—

P0031

Front HO2S heater control circuit low

P0032

Front HO2S heater control circuit high

P0037

Rear HO2S heater control circuit low

P0038

Rear HO2S heater control circuit high

P0101

MAF sensor circuit range/performance problem

—

P0102

MAF sensor circuit low input

P0103

MAF 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

P0121

TP sensor circuit range/performance problem

—

P0122

TP sensor circuit low input

P0123

TP sensor circuit high input

P0125

Insufficient coolant temperature for closed loop fuel control

—

P0132

Front HO2S circuit high voltage

P0133

Front HO2S circuit slow response

—

P0134

Front HO2S circuit no activity detected

—

P0138

Rear HO2S circuit high voltage

P0140

Rear HO2S circuit no activity detected

—

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

—

P0420

Catalyst system efficiency below threshold

—

P0443

Purge solenoid valve circuit problem

P0480

Cooling fan No.1 control circuit problem

P0500

VSS circuit problem

—

P0505

IAC system problem

—

P0506

IAC system RPM lower than expected

—

P0507

IAC system RPM higher than expected

—

P0511

IAC circuit problem

P0550

PSP switch circuit problem

—

P0602

PCM programming error

P0610

PCM vehicle options error

P0660^*1

Variable intake air circuit/open

P0668

PCM temperature sensor circuit low input

P0669

PCM temperature sensor circuit high input

P0703

Brake switch input circuit problem

—

P0704

CPP switch input circuit problem

—

P0850

Neutral switch input circuit problem

—

P1260

Immobilizer system problem

—

P1384

Variable valve timing control system operation error

—

P2006^*3

Variable tumble control stuck close

—

P2008

Variable tumble control circuit/open

P2088

Variable valve timing control circuit low

P2089

Variable valve timing control circuit high

P2096

Target A/F feedback system too lean

—

P2097

Target A/F feedback system too rich

—

P2177

System too lean off idle

—

P2178

System too rich off idle

—

P2187

System too lean at idle

—

P2188

System too rich at idle

—

P2195

Front HO2S signal stuck lean

—

P2196

Front HO2S signal stuck rich

—

P2228^*2

BARO sensor circuit low input

P2229^*2

BARO sensor circuit high input

P2502

Charging system voltage problem

—

P2503

Charging system voltage low

—

P2504

Charging system voltage high

—

P2507

PCM power input signal low

DTC No.	Condition	Test condition
P0011	CMP-timing over-advanced	—	×
P0012	CMP-timing over-retarded	—	×
P0030	Front HO2S heater control circuit problem	×	×
P0031	Front HO2S heater control circuit low	×	×
P0032	Front HO2S heater control circuit high	×	×
P0037	Rear HO2S heater control circuit low	×	×
P0038	Rear HO2S heater control circuit high	×	×
P0102	MAF sensor circuit low input	×	×
P0103	MAF sensor circuit high input	×	×
P0107	MAP sensor circuit low input	×	×
P0108	MAP sensor circuit high input	×	×
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 circuit low input	×	×
P0123	TP sensor circuit high input	×	×
P0130	Front HO2S circuit problem	×	×
P0131	Front HO2S circuit low input	×	×
P0132	Front HO2S circuit high voltage	×	×
P0134	Front HO2S circuit no activity detected	—	×
P0138	Rear HO2S circuit high voltage	×	×
P0140	Rear HO2S circuit no activity detected	—	×
P0222	TP sensor No.2 circuit low input	×	×
P0223	TP sensor No.2 circuit high input	×	×
P0327	KS circuit low input	×	×
P0328	KS circuit high input	×	×
P0335	CKP sensor circuit problem	—	—
P0340	CMP sensor circuit problem	—	—
P0351	Ignition coil No.1 control circuit malfunction	—	×
P0352	Ignition coil No.2 control circuit malfunction	—	×
P0353	Ignition coil No.3 control circuit malfunction	—	×
P0354	Ignition coil No.4 control circuit malfunction	—	×
P0401	EGR flow insufficient detected	—	×
P0403	EGR control circuit problem	×	×
P0443	Purge solenoid valve circuit problem	×	×
P0480	Cooling fan No.1 control circuit problem	×	×
P0500	VSS circuit problem	—	—
P0505	IAC system problem	—	×
P0601	PCM memory check sum error	×	×
P0602	PCM programming error	×	×
P0604	PCM random access memory error	×	×
P0606	PCM processor	×	×
P0610	PCM vehicle options error	×	×
P0638	Throttle actuator control circuit range/performance problem	—	—
P0660	Variable intake air circuit/open	×	×
P0668	PCM temperature sensor circuit low input	×	×
P0669	PCM temperature sensor circuit high input	×	×
P1260	Immobilizer system problem	×	—
P1384	Variable valve timing control system operation error	—	×
P1515	Current sensor circuit problem	×	×
P2008	Variable tumble control circuit/open	×	×
P2016	Variable tumble shutter valve switch circuit low	×	×
P2088	Variable valve timing control circuit low	×	×
P2089	Variable valve timing control circuit high	×	×
P2096	Target A/F feedback system too lean	—	—
P2097	Target A/F feedback system too rich	—	—
P2101	Throttle actuator power supply line circuit problem	—	×
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	×	×
P2126	APP sensor No.2 circuit range/performance problem	×	×
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	System too lean off idle	—	×
P2178	System too rich off idle	—	×
P2187	System too lean at idle	—	×
P2188	System too rich at idle	—	×
P2195	Front HO2S signal stuck lean	—	—
P2196	Front HO2S signal stuck rich	—	—
P2502	Charging system voltage problem	—	×
P2503	Charging system voltage low	—	×
P2504	Charging system voltage high	—	×
P2507	PCM power input signal low	×	×

DTC No.

Condition

Test condition

KOEO

KOER

P0011

CMP-timing over-advanced

—

P0012

CMP-timing over-retarded

—

P0030

Front HO2S heater control circuit problem

P0031

Front HO2S heater control circuit low

P0032

Front HO2S heater control circuit high

P0037

Rear HO2S heater control circuit low

P0038

Rear HO2S heater control circuit high

P0102

MAF sensor circuit low input

P0103

MAF sensor circuit high input

P0107

MAP sensor circuit low input

P0108

MAP sensor circuit high input

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 circuit low input

P0123

TP sensor circuit high input

P0130

Front HO2S circuit problem

P0131

Front HO2S circuit low input

P0132

Front HO2S circuit high voltage

P0134

Front HO2S circuit no activity detected

—

P0138

Rear HO2S circuit high voltage

P0140

Rear HO2S circuit no activity detected

—

P0222

TP sensor No.2 circuit low input

P0223

TP sensor No.2 circuit high input

P0327

KS circuit low input

P0328

KS circuit high input

P0335

CKP sensor circuit problem

—

P0340

CMP sensor circuit problem

—

P0351

Ignition coil No.1 control circuit malfunction

—

P0352

Ignition coil No.2 control circuit malfunction

—

P0353

Ignition coil No.3 control circuit malfunction

—

P0354

Ignition coil No.4 control circuit malfunction

—

P0401

EGR flow insufficient detected

—

P0403

EGR control circuit problem

P0443

Purge solenoid valve circuit problem

P0480

Cooling fan No.1 control circuit problem

P0500

VSS circuit problem

—

P0505

IAC system problem

—

P0601

PCM memory check sum error

P0602

PCM programming error

P0604

PCM random access memory error

P0606

PCM processor

P0610

PCM vehicle options error

P0638

Throttle actuator control circuit range/performance problem

—

P0660

Variable intake air circuit/open

P0668

PCM temperature sensor circuit low input

P0669

PCM temperature sensor circuit high input

P1260

Immobilizer system problem

—

P1384

Variable valve timing control system operation error

—

P1515

Current sensor circuit problem

P2008

Variable tumble control circuit/open

P2016

Variable tumble shutter valve switch circuit low

P2088

Variable valve timing control circuit low

P2089

Variable valve timing control circuit high

P2096

Target A/F feedback system too lean

—

P2097

Target A/F feedback system too rich

—

P2101

Throttle actuator power supply line circuit problem

—

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

P2126

APP sensor No.2 circuit range/performance problem

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