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An Overview of the by Lance Wiggins RE5R05A

tarting in mid-2002, JATCO failure modes this unit can experience. code that needs to be addressed before introduced the RE5R05A: a Some DTCs may be displayed at the checking any other codes in memory. rear-wheel drive, 5-speed same time; that is, it’s possible to have Sautomatic transmission used in the multiple codes set for the same failure. Failsafe Function Q45. Since then, this unit has Perform the necessary inspections one The TCM, which is part of the appeared in Infiniti and drive- by one based on the priority descrip- valve body (Figure 1), has an electri- trains. Infiniti uses it in CX25, FX35, tions covered in this article. cal failsafe mode. This mode makes it FX45, G35, M35/35x, Q45, and QX56 possible to operate even if there’s an vehicles. Nissan uses it in the 350Z, DTC U1000 error in a main electronic control input Frontier, Pathfinder, Armada, Titan, Before going any further, there’s or output signal circuit. If the computer and Xterra. one thing you should be aware of: DTC detects any faults in the systems sen- Let’s start by looking at the initial U1000. This is a CAN communication sors or solenoids, it switches to failsafe

12 GEARS January/February 2007

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pprecision1106.inddrecision1106.indd 1111 110/31/060/31/06 10:09:2410:09:24 AMAM An Overview of the JATCO RE5R05A

Turbine Speed Sensors TTCMCM

TCM Connectors

4 7 123 56

Figure 1 1. Line Pressure Solenoid 4. Front Brake Control Solenoid 2. Low Coast Brake Solenoid 5. Input clutch Control Solenoid 7. TCC solenoid 3. High and Low Solenoid 6. Direct Clutch Solenoid

operation. Failsafe allows the transmis- position. problem in one of these systems. If the sion to continue operating under lim- This should return the transmission vehicle speed sensor A/T (revolution ited conditions to make it possible to to a normal shift pattern. But be careful: sensor) fails, 5th gear and manual mode continue driving without damaging the Just because the transmission’s shift- won’t be possible. transmission. ing normally doesn’t mean the prob- Accelerator Pedal Position Sensor In failsafe mode, the transmission lem’s fixed. Always handle the situation — If there’s a failure in one of the sys- is fixed in 2nd, 4th or 5th, so the according to the conditions present, tems, TCM or ECM the accelerator customer should be complaining of a using a standard diagnostic procedure. opening angle is controlled by ECM slip or poor acceleration. Under special Here are some of the sensors and according to a predetermined accel- conditions (such as if you slam on the switches and their codes (Figure 2) that erator angle. And if there are failures in brakes while the wheels are spinning, can cause failsafe, and a description of TCM and ECM, the engine is fixed to a stopping the tire rotation suddenly), the their failures. predetermined RPM by the ECM (idle). transmission can go into failsafe even Vehicle Speed Sensor Signal Throttle Position Sensor — If when the computer controls are work- — Vehicle Speed Sensor signals are there’s a failure in one of the systems, ing properly. This is normal. provided by two separate systems: the the accelerator opening angle is con- If this happens, you can reset the vehicle speed sensor A/T (revolution trolled by ECM according to a pre- computer like this: sensor) installed on the transmission, determined accelerator angle. And if • Key off for about 10 seconds. and the combination meter. So normal there are failures in TCM and ECM, the • Turn the key back to the On-Run driving is possible even if there’s a accelerator opening angle is controlled

14 GEARS January/February 2007

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SSuperior-ad.indduperior-ad.indd 1515 112/26/062/26/06 10:49:4910:49:49 AMAM An Overview of the JATCO RE5R05A

by the idle signal sent from the ECM, either on or off. The ECM determines 1st Gear Engine Braking — When based on an input indicating either idle this signal based on engine RPM and there’s a 1st gear engine brake judgment or off-idle (predetermined accelerator battery voltage. If the starter relay is fault, the low coast brake solenoid is opening). switched off, the start circuit to the switched off to prevent engine braking. PNP Switch — In the unlikely starter is disabled. Line Pressure Solenoid — The event that a faulty signal enters the A/T Interlock — If there’s an A/T solenoid is switched off and the line TCM: interlock judgment failure, the trans- pressure is set to maximum to pre- • the position indicator is switched mission is fixed in 2nd gear. vent damage to the transmission during off, NOTE: When the vehicle is driven operation. • the starter relay is switched off fixed in 2nd gear, a turbine revolution Clutch (starting circuit is disabled), sensor DTC will set, but this doesn’t Solenoid — The solenoid is switched • the backup lamp relay is switched indicate a turbine revolution sensor fail- off to release the converter clutch. off (backup lights are off), ure. When the pressure switch assembly Low Coast Brake Solenoid — …and the position is fixed to the is in failsafe, the failsafe action cor- When an electrical or functional failure D range. responding to the pattern listed occurs occurs, the engine brake isn’t applied in Starter Relay — The PNP switch (Figure 3). 1st or 2nd gears. indicates the start signal status as being Figure 2 Clutch Pressure Output Pattern After ATF Pressure Switch Output Fail-safe Fail-safe Function Gear Position SW3 SW6 SW5 SW1 SW2 Function I/C HLR/C D/C FR/B LC/B L/U (I/C) (HLR/C) (D/C) (FR/B) (LC/B) A/T Interlock 3rd NG XXNG Held in 2nd Gear OFF OFF ON OFF OFF OFF Coupling 4th NG XXNG Held in 2nd Gear OFF OFF ON OFF OFF OFF Pattern 5th X NG NG X Held in 2nd Gear OFF OFF ON OFF OFF OFF NG= NO Good X= OK

16 GEARS January/February 2007

112Lance-RE5R05A.indd2Lance-RE5R05A.indd 1616 112/27/062/27/06 9:39:289:39:28 AMAM DTC Figure 3 OBD-II Except OBD-II Items (Consult-II Screen Terms) Consult-II GST (*1) Consult-II only "A/T" Input Clutch Solenoid — If an electrical or N/A P0615 Starter Relay Circuit functional failure occurs, the transmission is held P0700 P0700 TCM in 4th gear. P0705 P0705 PNP Switch Circuit P0710 P1710 ATF Temperature Sensor Circuit Direct Clutch Solenoid — If an electrical or P0717 P0717 Turbine Revolution Speed Sensor functional failure occurs, the transmission is held P0720 P0720 Vehicle Speed Sensor Circuit A/T in 4th gear. N/A P0725 Engine Speed Signal Front Brake Clutch Solenoid — If an electri- P0740 P0740 TCC Solenoid Circuit P0744 P0744 A/T TCC Solenoid Voltage Function cal or functional failure occurs with the solenoid P0745 P0745 Line Pressure Solenoid Circuit on, the transmission is held in 5th gear; if the sole- N/A P1705 Throttle Position Sensor Circuit Meter noid is off, 4th gear. N/A P1721 Vehicle Speed Sensor Circuit Meter P1730 P1730 A/T Interlock High and Low Reverse Clutch Solenoid — If N/A P1731 A/T 1st Braking an electrical or functional failure occurs, the trans- P1752 P1752 I/C Solenoid Circuit mission is held in 4th gear. P1754 (*2) P1754 I/C Solenoid Function P1757 P1757 FR/B Solenoid Circuit Turbine Revolution Sensor 1 or 2 — The P1759 (*2) P1759 FR/B Solenoid Function control is the same as if there were no turbine revo- P1762 P1762 D/C Solenoid Circuit lution sensor signals: 5th gear and manual mode P1764 (*2) P1764 D/C Solenoid Function P1767 P1767 HLR/C Solenoid Circuit are prohibited. P1769 P1769 HLR/C Solenoid Function As you can see, there are plenty of potential P1772 P1772 LC/B Solenoid Circuit problems with this transmission operating system. P1774 P1774 LC/B Solenoid Function Having the correct information will help you get N/A P1815 Manual Mode Switch Circuit N/A P1841 ATF Pressure Switch #1 Circuit the vehicle back on the road. In the next issue of N/A P1843 ATF Pressure Switch #3 Circuit GEARS, we’ll cover the valve body, case and some N/A P1845 ATF Pressure Switch #5 Circuit other internal failures that you may have to deal N/A P1846 ATF Pressure Switch #6 Circuit U1000 U1000 CAN Communication Circuit with. *1: These Numbers are prescribed by SAE J2012 *2: These malfunctions cannot be displayed MIL if another malfunction is assigned to MIL

GEARS January/February 2007 17

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