2002 MAZDA 6 engine

F1–46
CONTROL SYSTEM
CMP sensor signal
L3 engine (+)
PCM terminals
•2J(+)—2H(–)
Oscilloscope setting
•1 V/DIV (Y), 10 ms/DIV (X), DC range
Vehicle condition
•Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
LF engine (+)
PCM terminals
•2J(+)—2H(–)
Oscilloscope setting
•1 V/DIV (Y), 10 ms/DIV (X), DC range
Vehicle condition
•Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
L3 engine (–)
PCM terminals
•2M(+)—2H(–)
Oscilloscope setting
•1 V/DIV (Y), 10 ms/DIV (X), DC range
Vehicle condition
•Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
LF engine (–)
PCM terminals
•2M(+)—2H(–)
Oscilloscope setting
•1 V/DIV (Y), 10 ms/DIV (X), DC range
Vehicle condition
•Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
0 V
A6A3940W012
0 V
A6A3940W013
0 V
A6A3940W014
0 V
A6A3940W015

CONTROL SYSTEM
F1–47
F1
Input/turbine speed sensor signal
PCM terminals
•3G(+)—2AC(–)
Oscilloscope setting
•500 mV/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
Pressure control solenoid signal
(–)
PCM terminals
•3V(+)—1C(–)
Oscilloscope setting
•5 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
(+)
PCM terminals
•3Y(+)—1C(–)
Oscilloscope setting
•5 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
HO2S (front) heater control signal
PCM terminals
•4A(+)—1C(–)
Oscilloscope setting
•4 V/DIV (Y), 200 ms/DIV (X), DC range
Vehicle condition
•Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
0 V
A6A3940W016
0 V
A6A3940W017
0 V
A6A3940W018
0 V
A6A3940W019

F1–48
CONTROL SYSTEM
IAC signal
(+)
PCM terminals
•4G(+)—1C(–)
Oscilloscope setting
•2 V/DIV (Y), 0.4 ms/DIV (X), DC range
Vehicle condition
•Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
(–)
PCM terminals
•4J(+)—1C(–)
Oscilloscope setting
•2 V/DIV (Y), 0.4 ms/DIV (X), DC range
Vehicle condition
•Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
OCV control signal
PCM terminals
•4M(+)—1C(–)
Oscilloscope setting
•2 V/DIV (Y), 0.8 ms/DIV (X), DC range
Vehicle condition
•Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
Purge control signal
PCM terminals
•4U(+)—1C(–)
Oscilloscope setting
•1 V/DIV (Y), 10 ms/DIV (X), DC range
Vehicle condition
•Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
0 V
A6A3940W020
0 V
A6A3940W021
0 V
A6A3940W022
0 V
A6A3940W023

CONTROL SYSTEM
F1–49
F1
Fuel injection control
PCM terminals
•Fuel Injection No.1: 4Z(+)—1C(–)
•Fuel Injection No.1: 4W(+)—1C(–)
•Fuel Injection No.1: 4AD(+)—1C(–)
•Fuel Injection No.1: 4AA(+)—1C(–)
Oscilloscope setting
•4 V/DIV (Y), 10 ms/DIV (X), DC range
Vehicle condition
•Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
Shift solenoid C control
PCM terminals
•4Y(+)—1C(–)
Oscilloscope setting
•5 V/DIV (Y), 5 ms/DIV (X), DC range
Vehicle condition
•Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
Shift solenoid A control
PCM terminals
•4AB(+)—1C(–)
Oscilloscope setting
•5 V/DIV (Y), 5 ms/DIV (X), DC range
Vehicle condition
•Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
Shift solenoid B control
PCM terminals
•4AC(+)—1C(–)
Oscilloscope setting
•5 V/DIV (Y), 5 ms/DIV (X), DC range
Vehicle condition
•Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
End Of Sie
0 V
A6A3940W024
0 V
A6A3940W025
0 V
A6A3940W026
0 V
A6A3940W027

F1–52
ON-BOARD DIAGNOSTIC
End Of Sie
DTC (4WD)A6E397018881204•Detection logics and conditions are as shown below.
Controller Area Network (CAN)
PCM cannot receive any signals from TCM (U0101)
•PCM cannot receive any signals from TCM.
End Of Sie
OBD DRIVE MODEA6E397018881205•Performing the Drive Mode inspects the OBD system for proper operation. The Drive Mode must be performed
to ensure that no additional DTCs are present.
•During Drive Mode, the following systems are inspected:
—Oxygen sensor (HO2S)
—Oxygen sensor heater
—Catalytic converter (TWC)
Caution
•While performing the Drive Mode, always operate the vehicle in a safe and lawful manner.
•When the WDS or equivalent is used to observe monitor system condition while driving, be sure to
have another technician with you, or record the data in the WDS or equivalent using the PID/DATA
MONITOR AND RECORD function and inspect later.
Note
•Vehicle speed and engine speed detected by the PCM may differ from that indicated by the speedometer
and tachometer. Use the WDS or equivalent to monitor vehicle speed.
•If the OBD system inspection is not completed during the Drive Mode, the following causes are
considered:
1. The OBD system detects the malfunction.
2. The Drive Mode procedure is not completed correctly.
•Disconnecting the battery will reset the memory. Do not disconnect the battery during and after Drive
Mode.
PCM Adaptive Memory Procedure Drive Mode
Note
•The PCM adaptive memory condition can be confirmed with RFCFLAG PID.
•If RFCFLAG PID is “Learnt”, PCM Adaptive Memory Procedure Drive Mode is not necessary, because
PCM already has adaptive memory.
•If RFCFLAG PID is “Not Learnt”, PCM Adaptive Memory Procedure Drive should be performed before
HO2S Heater, HO2S, and TWC Repair Verification Drive Mode.
1. Start the engine and warm it up completely.
2. Verify all accessory loads (A/C, headlights, blower fan, rear window defroster) are off.
U0101 PCM cannot receive any signals from TCM ON 1 Other×
U0121PCM cannot receive any signals from ABS, ABS/TCS
or DSC HU/CMON 1 Other×
U0155PCM cannot receive any signals from instrument
clusterON 1 Other× DTC No. Condition MIL DC Monitor itemMemory
function

ON-BOARD DIAGNOSTIC
F1–53
F1
3. Perform no load racing at the engine speed
shown in the graph, then idle the engine for more
than 30 s after the cooling fan is stopped. If
possible, monitor RPM PID for engine speed and
FAN1 PID for cooling fan condition during this
procedure.
4. Turn ignition key off then on again.
5. Access to RFCFLAG PID to confirm PCM
adaptive memory condition. If RFCFLAG PID is
“Learnt”, PCM Adaptive Memory Procedure Drive
is completed.
6. If RFCFLAGPID is still “Not Learnt”, go back to
Step 1.
HO2S Heater, HO2S, and TWC Repair Verification Drive Mode
1. Access to RFCFLAG PID to confirm PCM adaptive memory condition. If RFCFLAG PID is OFF, perform PCM
Adaptive Memory Procedure Drive first.
2. If RFCFLAG PID is ON, start the engine and warm it up completely.
3. Verify all accessory loads (A/C, headlights, blower fan, rear window defroster) are off.
4. Drive the vehicle as shown in the graph; first drive in zone O, then A or B, followed by C or D, finally E or F.
Driving condition before the constant speed driving is not specified.
For MTX
2,800—3,200 rpm
IDLE
Above
30 sAbove
30 s
ENGINE SPEEDIDLE
A6E3970W003
ZoneShift
PositionVehicle Speed
km/h {mph}Time
Sec.
O Neutral 0 T1: Above 455
A2nd40—50 {25—32}
T2: Above 30
B3rd65—75 {41—47}
C2nd60—75 {38—46}
T3: Above 20
D3rd75—100 {47—62}
E4th50—75 {31—46}
T4: Above 120
F5th75—100 {47—62}
km/h {mph}
100 {62}
50 {31}
0 {0}O
T1 T2 T3 T4A BD
C
E F
A6E3970W004

F1–54
ON-BOARD DIAGNOSTIC
For L3 engine ATX
5. Stop vehicle and access to ON BOARD SYSTEM
READINESS menu of GENERIC OBD
FUNCTION to inspect the Drive Mode completion
condition. If completed, RFC changes from NO to
YES.
6. If not completed, turn the ignition key to OFF, then go back to Step 4.
7. Access DIAGNOSTIC MONITORING TEST RESULTS menu of GENERIC OBD FUNCTIONS to inspect the
monitor results. If MEAS are not within the specification, repair has not completed.
8. Verify no DTC is available.
End Of Sie
DTC TABLEA6E397018881206DTC table
×: Applicable
—: Not applicable
Zone RangeVehicle Speed
km/h {mph}Time
Sec.
OP or N 0T1: Above
455
A M (3rd) 40—65 {25—41}
T2: Above 30
B M (3rd) 65—80 {41—49}
C M (2nd) 60—75 {38—46}
T3: Above 20
D M (3rd) 80—95 {50—59}
EM (4th)50—75 {31—47}
T4: Above
120
FM (5th)75—100 {46—62}km/h {mph}
100 {62}
50 {31}
0 {0}O
T1 T2 T3 T4A BD
C
E F
A6E3970W999
DTC No. Condition MIL DC Monitor itemMemory
functionPage
P0010CMP actuator circuit
malfunctionON 1 CCM×—
P0011 CMP timing over-advanced ON 1 CCM×—
P0012 CMP timing over-retarded ON 1 CCM×—
P0031Front HO2S heater circuit low
inputON 2O
2 sensor heater
×—
P0032Front HO2S heater circuit high
inputON 2O
2 sensor heater
×—
P0037Rear HO2S heater circuit low
inputON 2O
2 sensor heater
×—
P0038Rear HO2S heater circuit high
inputON 2O
2 sensor heater
×—
P0101MAF sensor inconsistent with
TP sensorON 2 CCM×—
P0102 MAF circuit low input ON 1 CCM×—
P0103 MAF circuit high input ON 1 CCM×—
P0107 MAP sensor circuit low input ON 1 CCM×—
P0108 MAP sensor circuit high input ON 1 CCM×—
P0111 IAT circuit performance problem ON 2 CCM×—
P0112 IAT circuit low input ON 1 CCM×—
P0113 IAT circuit high input ON 1 CCM×—
P0117 ECT circuit low input ON 1 CCM×—
P0118 ECT circuit high input ON 1 CCM×—
P0121 TP stuck closed ON 2 CCM×—
P0122 TP circuit low input ON 1 CCM×—
P0123 TP circuit high input ON 1 CCM×—
P0125Excessive time to enter closed
loop fuel controlON 2 CCM×—
P0131Front HO2S no inversion (stuck
low)ON 2 CCM×—
P0132Front HO2S no inversion (stuck
high)ON 2 CCM×—

TROUBLESHOOTING
F1–57
F1
ENGINE SYMPTOM TROUBLESHOOTINGA6E398018881201•Confirm trouble symptom using the following diagnostic index, then go to appropriate troubleshooting chart.
Diagnostic Index
End Of Sie
TROUBLESHOOTING
No. TROUBLESHOOTING ITEM DESCRIPTION
1 Melting of main or other fuses—
2 MIL illuminates MIL is illuminated incorrectly.
3 Will not crank Starter does not work.
4Hard to start/long crank/erratic start/erratic
crankStarter cranks engine at normal speed but engine requires excessive
cranking time before starting.
5 Engine stalls. After start/at idle Engine stops unexpectedly at idle and/or after start.
6 Cranks normally but will not start Starter cranks engine at normal speed but engine will not run.
7 Slow return to idle Engine takes more time than normal to return to idle speed.
8 Engine runs rough/rolling idleEngine speed fluctuates between specified idle speed and lower
speed and engine shakes excessively.
9 Fast idle/runs onEngine speed continues at fast idle after warm-up.
Engine runs after ignition switch is turned to off.
10 Low idle/stalls during decelerationEngine stops unexpectedly at beginning of deceleration or recovery
from deceleration.
11Engine stalls/quits. Acceleration/cruiseEngine stops unexpectedly at beginning of acceleration or during
acceleration.
Engine stops unexpectedly while cruising.
Engine runs rough. Acceleration/cruise Engine speed fluctuates during acceleration or cruising.
Misses Acceleration/cruise Engine misses during acceleration or cruising.
Buck/jerkAcceleration/cruise/
decelerationVehicle bucks/jerks during acceleration, cruising, or deceleration.
Hesitation/stumble Acceleration Momentary pause at beginning of acceleration or during acceleration
Surges Acceleration/cruise Momentary minor irregularity in engine output
12 Lack/loss of power Acceleration/cruisePerformance is poor under load.
(e.g., power down when climbing hills)
13 Knocking/pinging Acceleration/cruiseSound is produced when air/fuel mixture is ignited by something other
than spark plug. (e.g., hot spot in combustion chamber)
14 Poor fuel economy Fuel economy is unsatisfactory.
15 Emission compliance Fails emissions test.
16 High oil consumption/leakage Oil consumption is excessive.
17Cooling system
concernsOverheating Engine runs at higher than normal temperature/overheats.
18Cooling system
concernsRuns cold Engine does not reach normal operating temperature.
19 Exhaust smoke Blue, black, or white smoke from exhaust system
20 Fuel odor (in engine compartment) Gasoline fuel smell or visible leakage
21 Engine noise Engine noise from under hood
22 Vibration concerns (engine) Vibration from under hood or driveline
23 A/C does not work sufficiently.A/C compressor magnetic clutch does not engage when A/C is turned
on.
24A/C is always on or A/C compressor runs
continuously.A/C compressor magnetic clutch does not disengage.
25 A/C is not cut off under WOT conditions. A/C compressor magnetic clutch does not disengage under WOT.
26 Exhaust sulphur smell Rotten egg smell (sulphur) from exhaust
27 Constant voltage Incorrect constant voltage
28 Spark plug condition Incorrect spark plug condition
29 ATX concernsUpshift/downshift/
engagementATX concerns not related to engine performance