Electronic Pressure Control Solenoid (Epc) - 5R55E Only - Mazda B-Series 1997 Workshop Manual

ON-BOARD DIAGNOSIS SYSTEM
1
Electronic Pressure Control Solenoid (EPCk5R55E Only
Note: Read and record all DTCs. All TR sensor and VSS DTCs must be repaired before
entering Output State Control (OSC).
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STEP
1
INSPECTION
/
using N G ~ Tester, select ACTIVE COMMANDS.
Enter OUTPUT STATE CONTROL.
Does vehicle enter OUTPlJT STATE CONTROL screen?
1 Check to make sure transrnission harness is fully seated, termi-
nals are fully engaged in connector and in good condition before
oroceedina.
I
Yes
I =
T - . . .
I
No
2
ACTION
; Go to step 2.
Remain in OUTPUT STATE CONTROL.
Wiggle all wiring and connectors to the transmission
Monitor solenoid state for changes.
Does suspect solenoid state change?
Repeat procedure. If vehicle still does not enter
OUTPUT STATE CONTROL, go to page FT-131 in
this manual for NGS communication concerns.
Repa~r open or short in vehicle harness.
Repair connector.
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I
Go to step 3.
3 Install 300 psi pressure gauge into EPC tap.
/
yes
/
CI
Monitor pressure gauge.
Select EPC command.
Command 15, 30, 45, 60, 70, 90 psi.
Go to step 4.
Does pressure reading match the commanded pressure?
--
Remove transmission fluid pan.
Visually inspect all wires and connectors for damage.
Connect positive lead to VPWR solenoid terminal and negative
lead to a good ground.
or short circuit in harness.
Is battery voltage present')
--
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Leave ~ositive lead connected to VPWR solenoid terminal and
Go to step 6.
connect negatlve lead to s~gnal term~nal of EPC solenold
Turn soleno~ds ON and OFF whlle mon~torlng voltage read~ng,
solenold state on the NGS (ON and OFF)
1
Check for open or short clrcu~t In harness or PCM
L~sten for activat~on of solenold (cllck)
Does voltage and solenoid state change?
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Disconnect veh~cle harness from transm~sslon yes
I
GO to step 7
Check solenold reslstance by connecting ohmmeter to solenold
terminals
Measure and record EPC solenold res~stance No Replace EPC solenoid
Res~stance should be between 3
1
to 5
7
ohms
Is resistance w ~ t h ~ n spec~f~cat~ons?
I I
Check for continuity between engine ground and EPC solenoid
terminals.
Connection should have rio continuity (infinite).
Is there continuity?
Replace EPC solenoid
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Refer to Quick Diagnosis Chart for further diagnosis
of pressure concerns