Trionic System - Service Manual Update
CATEGORYEngine
SECTION
2
PAGE
23
ISSUE
11/92-0271
CODE
234
Subject:
Correction to Service Manual
Application:
9000 2:7 TRIONIC Engine Management System
The following corrections to 2:7 TRIONIC Engine Management System Service Manual (P/N 03 46 924) should be noted:
^ Pages 4. 24, 46, 48, 86, 87, 89 and 91:
Voltage indicated in parenthesis for resistance value at 20~C should read 2.3 (not 3.2).
^ Page 23:
Color for Pin No. 2 for the MAP sensor should be grey.
Color for Pin No. 3 for the MAP sensor should be blue/white.
^ Page 24:
The lead colors listed on this page are reversed: pin no. 1 should read white and pin no. 2 should read black. Also, the connection to/from description for pin no. 1 is incorrect. It should read: Ground via ECM pin 67.
^ Pages 28, 54, 114, 143 and 169:
The color indication for pins 2 for the ignition discharge module (IDM) and 9 for the engine control module (ECM) should be brown/white (rather than orange or OG as indicated).
^ Page 39:
Voltage readings indicated are incorrect. Typical voltages are approximately 0.6 VDC at idle, 1.25 VDC at 2,500 RPM (no load) and 12 VDC at full throttle under load (such as during stall testing).
^ Page 41:
Correct second paragraph to read "Current is taken from the back-up light switch ...".
^ Pages 50, 85, 86, 87, 88, 97, 147 and 169:
On the wiring diagram pin 67 is referred to as an input signal. It is a reference ground and all areas where it is indicated should reflect this fact.
^ Page 60:
The RPM values indicated at the bottom of the page are approximate. For the SHIFT UP function to be activated, the coolant temperature must be above 40~ (104~F). At speeds higher than 5500 rpm, the light will remain lit, regardless of the gear selected.
Page 62:
Although this page indicates ECM output signal, it is actually an Input signal. ECM pin 50 monitors oxygen sensor preheater current and will set a diagnostic trouble code (DTC) if it is out of range (500 mA - 2300 mA).
Pages 73 and 74, and 92:
Diagnostic Trouble Code (DTC) P0120, P0121, P0122 and P0123 indicate that they are not applicable to vehicles equipped with TCS. This is not the case: they do apply.
Please note however, that the diagnostic procedures detailed on page 92 are not correct for TCS-equipped vehicles. Follow the procedures outlined below for TCS vehicles if any of the above DTC's are retrieved:
1. On cars equipped with Traction Control, throttle angle information is provided by the ETS system. Before troubleshooting the TRIONIC system for any throttle signal related codes, check ETS with I SAT and repair any faults you find (if the ETS system has gone into the "Limp Home" mode, you may find this code in TRIONIC.)
Also, check the lead between pin 26 of the ETS ECM and pin 57 of the TRIONIC ECM for continuity and shorting. The signal is a PWM signal in which voltage will vary between 0.6V (idling) and 12V (full throttle). If the ETS system and the leads are OK, clear the DTC.
NOTE:
DTC's can be set erroneously by the ETS ECM in conjunction with a POWER OFF test.
2. Check that the throttle signal is being generated by the ETS system by entering TRIONIC command code EE30 on ISAT.
With ignition on, engine running, check that the correct throttle angle is displayed: approx. 13" when idling and gradually increasing as the throttle is opened to about 85" at wide open throttle.
3. Turn off the ignition and connect a Break Out Box (BOB) between the ECM and the vehicle's wiring harness connector. Connect your DVOM between BOB pin 57 and battery ground.
With the engine running you should see approximately 0.6 VDC at idle. At 2,500 RPM you should see approximately 1.25 VDC. NOTE: These are approximate values. The actual number is not as important as the relative amount of change.
4. If the voltage readings are incorrect, use a logic probe to isolate the problem. With the engine running, you should see a pulsed digital signal. All three lights should be blinking. The ETS ECM is providing the TRIONIC ECM with a signal in the form of digital pulses. A constant HI signal at BOB pin 57 would indicate a fault on the ETS end of the circuit or an open circuit in the harness (check pin 6 of connector H10-13). A constant LO signal would indicate that the signal wire is shorted to ground somewhere in the harness.
^ Page 75:
Diagnostic Trouble Code (DTC) P0605 should read as P1605 in both the "Malfunction/faulty component" column and the "Text displayed on ISAT Scan Tool" column.
^ Page 77:
Due to the present programming of ISAT, the response indicated when Command EE40 Is given must be multiplied by 10 in order to achieve the proper value.
^ Page 78:
Command Code EF20 (solenoid valve) as shown on this page should show the opening status of this valve as a percentage. Instead, when employing is this figure is shown in degrees. This may prove confusing as it could lead to a value being shown as a negative. The open condition of the valve should be indicated as a percentage, where 0% indicates the valve is fully closed and 100% indicates that the valve is fully open. The chart shown in Figure 1 shows the relationship between the amount of opening in degrees on the vertical axis and the actual value as a percentage on the horizontal axis.
Some important points with regard to degrees vs. percentage are shown in Figure 2.
^ Pages 79-81:
Command codes 3021, 3042 and 3142 should indicate "not ETS".
^ Page 136:
Point one on this page incorrectly refers to command EE61. This should read EE63.
^ Pages 143-147:
We will be issuing a pin check chart developed in the U.S. within a few weeks to aid in diagnosis of TRIONIC equipped vehicles.
^ Page 171:
The lead to pin 35 of the control module is indicated on the wiring diagram as being Red/Yellow. It should read Yellow/Red.
^ Clarification:
The TRIONIC system uses system number 10 in the black diagnostic socket (solid black square symbol - # 10) which is in the heading of all diagnostic trouble code and command code tables.
General fault tracing points are given on page 148.
^ Wiring Diagram:
Crimp J67, joining leads to ECM pin 67 must be changed to J68 on all relevant wiring diagrams.