Mazda MX-6 1998, Workshop Manual

Page: 34 / 1282

TROUBLESHOOTING [ENGINE CONTROL FS]
Playback of Stored PIDs Procedure
Note
• Look for abnormal behavior or values that are
clearly incorrect. Inspect the signals for abrupt
or unexpected changes.
• Look for agreement in related signals.
• Make sure signals act in proper sequence.
1. Select VIEW RECORDER AREAS.
2. Select a view area.
3. Select up to the four PIDs to review in the table
format or two PIDs to review in the graph mode.
4. Table format: Scroll through the PID data while
analyzing the information. Look for sudden drops
or spikes in the values.
For example:
Notice the major jump in the TP voltage while
scrolling through the information. This example
would require a smooth and progressive throttle
pedal travel during a key ON and engine OFF
mode.
TIME ECT TP
MAF ||
-0 .8 182 55.5
10.8
0.0 183 ,99.3
11.3
+0.2
1 8 4
65.4
11.5
SEC / % Q/S I
SUDDEN SPIKE — POSSIBLE FAULT
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5. Graph format: Scroll through the PID data while
analyzing the information. Look for sudden drops
or spikes in the linear lines showing the
transformation of values to the line graph.
I I
DIAGNOSTIC TEST MODE
PID/DATA MONITOR AND RECORD
A C T IV E C O M M A N D M O D E S
DIAGNOSTIC TROUBLE CODE LIBRARY
SELECT IT E » AND PRESS TRIGOER TO START
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5. Move the OUTPUT TEST MODE. Press the
trigger key to enter this selection.
6. Press MODE (Key #3) repeatedly to change the
mode from ALL ON to LOW FAN, HIGH FAN,
and ALL OFF. Return the mode to ALL ON.
7. Press START (Key #4) to run the fuel pump.
Press STOP (Key #4) to turn off the fuel pump.
8. To open and close certain actuators in the
emission system, press PIDS (Key #7).
9. Press CLEAR (Key #5) to clear previous selected
PIDS.
Note
To select desired PIDs, place the shaded bar
over the item(s) and press trigger. A star
symbol appears next to the item when it’s
selected. Press
START (Key #7). The
selected PID(s) and values appear.
You can only select 30 PIDs at a time.
10
Press START (Key #4) to turn on the fuel pump.
Observe the values change from OFF to ON or
from 0% to 100%. Press STOP (Key #4) to turn
off the fuel pump.
11. Press CANCEL.
Oxygen Sensor Monitoring Test Results Access
Procedure
Note
The Oxygen Sensor Monitoring Test Results
allows access to on-board oxygen sensor fault
limits and actual values during OBD II drive
mode.
NON LINEAR —
POSSIBLE FAULT IN SENSOR/CIRCUIT
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Output Test Mode Procedure
1. Perform the “New generation star (NGS) tester
hook-up procedure."
2. Perform step 1 through step 9 from the “Reading
DTC Procedure” .
3. Turn key on.
4. Move the cursor to
ACTIVE COMMAND MODES.
Press the trigger key to enter this selection.
1. Perform the “New generation star (NGS) tester
hook-up procedure."
2. Select VEHICLE AND ENGINE SELECTION.
3. Select NEW VEHICLE YEAR & MODEL. Select
year, engine, model with appropriate qualifier, if
needed. (R eferto Reading DTCs Procedure.)
I NO V E H IC LE S E LE C TE D B
[
d e s e l e c t
C U R R E N T M O D E L ■
SELECT ITEM AUD PRESS TRIGGER TO START
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0 1 -0 1 A -6