Electronic Pressure Control Solenoid (Epc)-4R44E Only - Mazda B-Series 1997 Workshop Manual

ON-BOARD DIAGNOSIS SYSTEM
K
signal pln at transm~ss~on connector
No Service open clrcults Go to step 13
1
1 Measure resistance between test pins 71197 at BOB and appropri-
---. ~.
-~
~
Diagnostic trouble code
Electronic Pressure Control Solenoid (EPC)-4R44E Only
NO. P0746, P1745, P1747. PI749
~
1
ate s~gnal plns at transmlss~on connector
1
1
Is each
resistance
less than
5
ohms7
4
1
Ensure BOB 1 s Installed
I
Yes Go to step 5
!
Ensure transmlsslon vehlcle harness connector and PCM are
ACTION
Remain in OUTPUT TEST MODE.
Go to step 2.
Repeat procedure. If vehicle still does not enter
OUTPUT TEST MODE, go to page FT-131 in this
manual.
Go to step 5.
STEP
1
INSPECTION
6
1
Using trans tester, set MODE switch to BENCH.
I
Rotate GEAR SELECTOR switch to OHMS CHECK position
1
heck to make sure transrnission harness is fully seated, terml-
als are fully engaged in connector and in good condition before
sing NGS Tester, perform KOEO self-test.
elect Active Commands and enter Output Test Mode.
elect ALL ON mode.
ush START to turn outputs ON and STOP to turn outputs OFF.
oes vehicle enter Output Test Mode?
2
1
disconnected.
!
Measure resistance between test pin 81 and test pins 77, 103, 76
1
Using ohmmeter, connect negative test lead to EPC jack and
positive lead to VPWR jack on tester. This is to test EPC solenoid
and harness. Record resistance.
Is resistance between 3.1 to 5.7 ohms?
Yes
No
Yes
Do not pry u p on connector. Depress release button then
pull u p o n connector.
isconnect 16-pin transmission vehicle harness connector.
i
5
and 91 at BOB and chassis ground.
Is each resistance greater than 10,000 ohms?
- -
Ensure transmission vehicle harness connector is disconnected.
Reconnect PCM.
Install line pressure gauge at line tap on-case.
Install transmission tester 49 UNOI 071 and 4R44E cable overlay
1
NO
/
Serv~ce short CIrcult GO to step 13
Go to step 3.
Go to step 4.
sing a mirror, inspect both ends of connector for damaged or
ushed out pins, corrosion, loose wires and missing or damaged
49 UNOI 132.
Set MODE switch to DRIVE.
Rotate GEAR SELECTOFl switch to
I
st GEAR position.
Perform EPC functional test. Refer to Transmission Tester in this
, section.
1
Does EPC (LED green) activate when EPC switch is depressed.
Observe line pressure on gauge while depressing EPC switch
(vehicle must be running).
Does line pressure drop?
7
Yes Replace PCM. Go to step 13
!
Ensure transmission vehic:le harness connector is disconnected.
Disconnect PCM and install 104-pin breakout box (BOB).
Measure resistance between test pin 81 at BOB and appropriate
,
seals.
Note
Refer t o connector information and solenoid application
chart following this test.
Using voltmeter, connect positive lead to VPWR terminal and
negative lead to solenoid circuit of transmission vehicle harness
connector. Set voltmeter to 20-volt scale.
Using NGS tester, press START and STOP to cycle solenoid
I
output ON and OFF.
I
Does suspect solenoid ou~put voltage change at least 0.5 volts?
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3 I Key OFF.
Check for continuity between BAT
-
(engine ground) and
appropriate jack with an ohmmeter.
For EPC test, use EPC or EPC VPWR jack.
Connection should show infinite resistance (no continuity).
Is
there continuity?
No Go to step 6
No
Yes
Yes
p ; :
step 7
Internal harness or solenoid may be damaged.
1
No
/
Go to step 8.
1
Yes
1
GO to step 8.
I
Refer to Quick Diagnosis Chart in this section to
diagnose hydraulic/mechanical concerns.